Hook a loaded trailer to a stock F-150 and you feel it instantly. The rear squats, the headlights point at the treetops, and every bump sends a slow wallow through the cab. The factory leaf springs are tuned for ride comfort when the bed is empty, not for the steady, planted feel you want when you are dragging a few thousand pounds down the interstate. The good news is that the F-150 is one of the easiest trucks to fix, and you do not need a lift kit or a fabricator to do it.
We pulled together the seven suspension upgrades that actually earn their place on a tow rig, from inflatable air bags that let you dial in level for any load, to helper springs that bolt on in an afternoon, to shocks that kill the bounce. We looked at how each part handles real trailer weight, how hard it is to install in a home garage, and how it rides when the trailer comes off. Below is what we found, ranked best first.
| Photo | Product | Score | Buy |
|---|---|---|---|
 |
Air Lift LoadLifter 5000 Ultimate Air Spring Kit (88340) Best Overall Rear air helper springs, 5,000 lb leveling capacity, internal jounce bumper |
9.5 | 🛒 Check Price |
 |
Hellwig EZ-990 Big Wig Air Spring Kit Best Heavy-Duty Air Bag Rear air helper springs, EZ no-drill brackets, sway and roll control focus |
9.2 | 🛒 Check Price |
 |
Timbren FR1504E SES Rear Suspension Enhancement System Best No-Maintenance Option Hollow Aeon rubber spring, bolt-on, no air and no maintenance |
9.0 | 🛒 Check Price |
 |
Bilstein 5100 Series Rear Shock Absorber Best Shocks for Towing Monotube gas shock, 46mm piston, digressive valving |
8.9 | 🛒 Check Price |
 |
SuperSprings SumoSprings Solo SSR-106-47-1 Best Bolt-On Helper Spring Microcellular polyurethane helper spring, bolt-on, no air required |
8.7 | 🛒 Check Price |
 |
Roadmaster 1139-HD Active Suspension Kit Best for Sway Control Self-adjusting coil spring helper, mounts to leaf spring, no air |
8.5 | 🛒 Check Price |
 |
Firestone Ride-Rite 2430 Air Helper Spring Kit Best Value Air Kit Rear air helper springs, up to 5,000 lb leveling capacity, bolt-on |
8.2 | 🛒 Check Price |
1. Air Lift LoadLifter 5000 Ultimate Air Spring Kit (88340): Best Overall
If you tow regularly and the load changes from trip to trip, an adjustable air spring is the most all-around fix you can bolt to an F-150, and the LoadLifter 5000 Ultimate is the one we kept coming back to. The air bags sit between the frame and the axle and take over the moment the rear starts to squat. Air them up to suit a heavy travel trailer, then drop the pressure back down for an empty bed and a soft ride. That range is the whole point, and nothing else here matches it. With a few thousand pounds on the hitch we saw the truck sit dead level and the rear end stop wallowing over expansion joints.
The honest weakness is convenience. This is the manual kit, so you need a portable compressor or a gas station air hose to change the pressure, and you have to remember to do it before you load. If you want to inflate from the cab you have to step up to a wireless onboard compressor version, which adds wiring to the install. For a driver who plans loads ahead, though, the manual kit is plenty, and the internal jounce bumper inside each bag gives it a safety margin the cheaper bags simply do not have.
- Adjustable air bags inflate from 5 to 100 psi so you can match any trailer tongue weight
- Internal jounce bumper protects the bag if you ever run it flat or hit a hard bump
- No-drill bracket design on most F-150 model years for a bolt-on rear install
Pros: Lets you level the truck exactly, regardless of load; Huge improvement in sway and squat control under heavy tongue weight; Internal bumper makes it the most failure-tolerant bag on the list
Cons: Manual air kit means you stop and add air with a compressor for each load; Slightly busier install than a simple helper spring
2. Hellwig EZ-990 Big Wig Air Spring Kit: Best Heavy-Duty Air Bag
Hellwig has been building anti-sway and load-control hardware for decades, and the EZ-990 leans into that heritage. Where some air kits aim only at curing rear squat, this one is tuned to keep the body flat through corners and crosswinds with a trailer back there. On a windy stretch of highway it noticeably cut the slow side-to-side rock that makes a long tow tiring. The brackets are thick and the whole assembly feels like it was built to be loaded hard and often rather than just to look the part.
The trade-off is ride character when you are not towing. The Hellwig setup runs a touch firmer than the softest bags here, so an empty bed over rough pavement feels a little more lively. You can air the bags down to soften that, but you will be doing it manually unless you wire in a compressor. For a buyer who tows heavy and values a planted, roll-free feel over plush empty-bed comfort, this is a standout.
- Heavy-gauge formed brackets built for repeated heavy towing
- Tuned to fight body roll and sway, not just rear sag
- EZ design avoids drilling the frame on common F-150 fitments
Pros: Excellent at flattening out body roll on a loaded trailer; Burly bracketry that feels built for years of work; Adjustable like any air bag, so you can fine-tune by load
Cons: Stiffer feel than some bags when running empty; Manual inflation unless you add a separate compressor kit
3. Timbren FR1504E SES Rear Suspension Enhancement System: Best No-Maintenance Option
For drivers who do not want to think about their suspension at all, Timbren is the answer. Instead of an air bag, each side gets a hollow Aeon rubber spring that hangs off the frame above the axle. With the trailer off, the spring barely touches and the truck rides like stock. Add weight and the axle rises into the rubber, which firms up progressively the more you load. There is nothing to inflate, nothing to leak, and nothing to inspect, which is exactly why it is so popular with people who just want to hook up and go.
The compromise is that you give up adjustability. An air kit lets you dial in a specific pressure for a specific trailer, while the Timbren is a fixed curve. Run a very heavy tongue weight and you will feel the rubber engage with a firmer, more direct contact than an air bag would give. But for a buyer who tows the same trailer regularly and hates maintenance, the FR1504E is a set-it-and-forget-it upgrade that just works.
- Progressive hollow rubber spring engages only when the suspension compresses
- Zero air lines, no inflation, and nothing to check before a trip
- Bolts to the frame in well under an hour with hand tools
Pros: Truly maintenance-free, nothing to leak or lose pressure; Lets the stock suspension ride normally until the load presses it down; Very fast, forgiving install for a first-timer
Cons: Not adjustable, so it cannot fine-tune level the way air bags can; Firmer contact feel once the rubber spring fully engages
4. Bilstein 5100 Series Rear Shock Absorber: Best Shocks for Towing
People obsess over springs and air bags and then forget that the shocks are what actually control the motion. A tired factory shock lets the rear keep bouncing after every bump, and with a trailer pushing on the hitch that wallow gets dangerous. The Bilstein 5100 is the upgrade that settles it down. The big 46mm monotube bore and gas-charged valving keep the rear axle planted instead of oscillating, so the truck feels tied down rather than floaty when you are loaded. On a long descent the larger bore also sheds heat better than the small factory shock, so the damping does not go soft halfway through the trip.
The thing to understand is what a shock does and does not do. The 5100 will not lift a sagging rear end, that is the job of springs or air bags. What it does is control how the truck moves over every bump and dip, and that is a huge part of feeling safe with a trailer. The ride is firmer than a soft, worn-out factory shock, which a few drivers read as harsh at first. Pair these with a helper spring or air bag from this list and you have the most complete towing setup of anything here.
- Large 46mm monotube bore for better heat control on long tows
- Digressive valving stays composed over bumps under load
- Direct bolt-on replacement for the worn factory shocks
Pros: Dramatically reduces post-bump bounce with a trailer attached; Monotube design resists fade on long, hot highway pulls; Improves control loaded and empty, not just one or the other
Cons: Shocks alone do not stop rear sag, they control motion; Firmer ride than the soft, worn factory shocks they replace
5. SuperSprings SumoSprings Solo SSR-106-47-1: Best Bolt-On Helper Spring
SumoSprings split the difference between a hard rubber helper and an adjustable air bag. The spring itself is a block of microcellular polyurethane, basically a dense closed-cell foam, that compresses smoothly as the suspension loads up. Compared with a solid rubber Timbren-style spring, the engagement is a little softer and more gradual, which some drivers prefer over rough roads. It bolts in above the axle with the supplied brackets and then asks nothing of you ever again, no air lines and no checking pressure before a trip.
Like any fixed-rate helper, the limitation is that you cannot tune it. It is built around a target load, and a very heavy or very light trailer will not get the custom level that an air kit allows. It also will not lift as much as a 5,000 lb air spring under an extreme tongue weight. For the buyer who wants the simplicity of a maintenance-free helper but a slightly cushier feel than hard rubber, the SumoSprings Solo is a smart middle path.
- Closed-cell foam spring flexes progressively as the load grows
- No air, no maintenance, and no moving parts to wear out
- Bolts above the axle with the included brackets and hardware
Pros: Softer initial engagement than a hard rubber bump stop; Maintenance-free with nothing to inflate or service; Reduces squat and sway noticeably on a loaded hitch
Cons: Fixed rate, so it cannot be tuned per load like air bags; Less ultimate leveling than a high-capacity air spring
6. Roadmaster 1139-HD Active Suspension Kit: Best for Sway Control
Roadmaster Active Suspension, usually just called RAS, takes a different route than bags or rubber. It clamps a self-adjusting coil spring to each rear leaf pack, and a center bolt lets each side flex independently. That independence is the clever part. When one rear wheel drops into a dip the spring lets it move, so you keep traction and the truck does not get jittery, but the moment a trailer tries to push the back end sideways the springs resist it. In practice it is one of the better setups here for taming the slow sway that builds on a long, windy tow.
The downside is the install. Threading the coils and brackets onto the leaf packs takes more patience than dropping in an air bag, and you will want a couple of hours and the right sockets. Empty, you also feel a bit more of the road through the rear than you did stock, since the helper is always engaged to some degree. For a driver whose main complaint is sway rather than raw sag, though, the RAS kit is purpose-built for exactly that problem.
- Self-adjusting design loads progressively with the weight you carry
- Coil springs clamp to the factory leaf packs for a no-drill install
- Targets trailer sway, body roll, and rear-end wander
Pros: Excellent at calming trailer sway and crosswind push; Lets the rear flex naturally when one wheel drops; No air to maintain and no pressure to set
Cons: Coil and bracket install is fiddlier than a simple bag kit; Some added road feel transmitted when the bed is empty
7. Firestone Ride-Rite 2430 Air Helper Spring Kit: Best Value Air Kit
If you want the adjustability of air without the most loaded-up bracket package, the Firestone Ride-Rite is the practical choice. It uses the same kind of convoluted air spring you will find under work trucks everywhere, and it delivers up to 5,000 lb of leveling support, which is plenty to bring a squatting F-150 back to level under a heavy trailer. The install is a clean bolt-on, the brackets are well documented, and because Firestone air springs are so common, replacement parts and fittings are easy to source down the road.
The one caution is that the standard Ride-Rite bags do not have an internal jounce bumper. That means if you ever run them at very low pressure or fully empty and then hit a hard bump, you can pinch and damage the bag, so you need to keep a few psi in them at all times. It is a manual kit as well, so plan on adding air before you load. Mind those two things and you get genuine adjustable air leveling that delivers strong value for the money.
- Convoluted air springs deliver up to 5,000 lb of leveling support
- Proven Firestone air spring used across countless tow rigs
- Straightforward bolt-on rear install with included brackets
Pros: Adjustable air leveling at a strong value; Big leveling capacity for serious tongue weight; Widely supported with easy-to-find replacement parts
Cons: No internal bumper, so running the bags flat can damage them; Manual inflation unless you add an onboard compressor
Frequently Asked Questions
Do air bags increase the towing capacity of my F-150?
No, and this is the most important thing to understand before you buy. Air helper springs, helper springs, and upgraded shocks all improve how your truck handles a load, but they do not raise the legal or engineered towing and payload limits set by Ford. Those limits are governed by the frame, axle, brakes, and drivetrain, which a suspension part does not change. What these upgrades do is let you safely use the capacity you already have, by stopping the rear from sagging, leveling the headlights, and calming sway. Always stay within the GVWR and GCWR on your door jamb sticker, then add a suspension upgrade to make towing within those limits feel far more controlled.
Air bags, helper springs, or shocks, which should I buy first?
It depends on your main complaint. If the truck squats and the headlights aim high when you hook up, you need load support, which means air bags or helper springs first. Air bags win if your trailer weight changes often because you can adjust the pressure, while a rubber or foam helper spring like Timbren or SumoSprings wins if you want zero maintenance and tow the same load every time. If the truck instead feels bouncy and wallows over bumps but does not really sag, the problem is worn shocks, and a set like the Bilstein 5100 is the fix. Many serious towers eventually run both a load support upgrade and fresh shocks together, because springs hold the truck up and shocks control how it moves.
Can I install these F-150 suspension upgrades in my own garage?
For most of these, yes. Helper springs like the Timbren and SumoSprings bolt to the frame above the axle and can be done in well under an hour with basic hand tools and a jack. Shock replacement is a straightforward bolt-on as well. Air bag kits take a bit longer because you mount the bags between the frame and axle and route an air line to a fill valve, but the no-drill kits are designed for a home mechanic with a socket set and a couple of hours. The Roadmaster coil kit is the fiddliest of the group since the springs clamp onto the leaf packs. None of them require welding or cutting if you buy the correct kit for your F-150 generation and cab configuration.
Will a suspension upgrade make my F-150 ride rough when the bed is empty?
It can, but how much depends on the type you choose. Adjustable air bags are the most forgiving because you can drop the pressure to a few psi when the bed is empty and let the factory springs do the work, keeping the soft stock ride. Fixed helper springs such as Timbren and SumoSprings are tuned to barely touch when unloaded, so empty ride stays close to stock until weight presses the suspension into them. The firmest empty-bed feel tends to come from heavy-duty kits like the Hellwig air bags or the Roadmaster coils, which stay partly engaged at all times. If a plush empty ride matters most to you, lean toward an adjustable air kit or a light helper spring.
Does adding helper springs or air bags help with trailer sway?
Yes, indirectly, and it is one of the biggest reasons people install them. Sway gets worse when the rear of the truck sags and the suspension is overwhelmed, because the trailer is then steering a soft, unsettled back end. By keeping the truck level and the rear planted, air bags and helper springs give the trailer a stable platform to push against, which reduces the slow side-to-side rock on the highway. Kits tuned specifically for roll control, like the Hellwig Big Wig and the Roadmaster Active Suspension, go a step further and actively resist body roll. That said, suspension upgrades complement a proper weight-distribution hitch and sway bar rather than replace them, so use both for the steadiest tow.
Our Verdict
For most F-150 owners who tow, the Air Lift LoadLifter 5000 Ultimate is the upgrade we would buy first. The adjustable air bags let you level the truck for any trailer, the internal jounce bumper makes it the most failure-tolerant kit here, and the difference in squat and sway control is immediate. If you tow heavy and care most about a flat, roll-free feel through corners and crosswinds, the Hellwig EZ-990 Big Wig is the runner up and a genuinely tougher-feeling bracket package. And whichever load-support kit you choose, a fresh set of Bilstein 5100 shocks is the partner upgrade that turns a good towing setup into a great one.
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Video: Related tutorial from YouTube