After researching manufacturer specifications, safety standards, and owner feedback, we evaluated the top side mount truck boxes on the market. These boxes mount directly to the truck bed side rails, offering secure storage without sacrificing bed space. Our comparison focuses on build quality, weather resistance, locking mechanisms, and ease of installation to help you choose the right one for your truck.
| Photo | Product | Score | Buy |
|---|---|---|---|
 |
Weather Guard Saddle Box 1350-0-01 Best Overall Aluminum, 18.5"W x 11"H x 73"L, 30 lb capacity |
9.2 | 🛒 Check Price |
 |
Dee Zee DZ8500 Heavy Duty Side Mount Tool Box Best Value Steel, 16"W x 12"H x 72"L, 25 lb capacity |
8.7 | 🛒 Check Price |
|
🚗
|
Rugged Ridge 18003.07 Black Side Mount Tool Box Best for Jeep Gladiator Black powder-coated steel, 15"W x 10"H x 60"L, 20 lb capacity |
8.4 | 🛒 Check Price |
|
🚗
|
UWS EC-111 Economy Aluminum Side Mount Tool Box Lightweight Pick Aluminum, 14"W x 10"H x 60"L, 15 lb capacity |
8.1 | 🛒 Check Price |
|
🚗
|
Kobalt 72 in. Aluminum Side Mount Tool Box Spacious Choice Aluminum, 72"L x 11"H x 16"W, 28 lb capacity |
7.8 | 🛒 Check Price |
|
🚗
|
TruckCraft 60 in. Diamond Plate Steel Side Mount Tool Box Budget Pick Steel, 60"L x 12"H x 15"W, 22 lb capacity |
7.3 | 🛒 Check Price |
|
🚗
|
Delta III 61 in. Black Aluminum Side Mount Tool Box Compact Option Aluminum, 61"L x 9"H x 14"W, 18 lb capacity |
7.9 | 🛒 Check Price |
1. Weather Guard Saddle Box 1350-0-01: Best Overall
In our evaluation, the Weather Guard Saddle Box stands out for its rugged build and excellent weather sealing. The diamond plate aluminum resists dents and corrosion, and the continuous weather seal keeps out moisture and dust. Owner feedback consistently praises its durability and the smooth operation of the rotary latches. However, the box is heavy, which may make installation a two-person job for some trucks.
This box is ideal for professionals who need reliable, long-term storage in harsh conditions. If you have a compact truck or need a lighter option, consider a polymer model instead. The price reflects premium materials, but for those who demand toughness, it is a solid investment.
- Heavy-duty diamond plate aluminum construction with stainless steel hinges and rotary latches
- Continuous weather seal keeps contents dry and dust-free
- Easy installation with included mounting hardware and adjustable hold-down brackets
Pros: Extremely durable and dent-resistant; Smooth, secure locking mechanism
Cons: Heavy at over 30 pounds
2. Dee Zee DZ8500 Heavy Duty Side Mount Tool Box: Best Value
Based on owner feedback and the spec sheet, the Dee Zee DZ8500 offers impressive value for a steel side mount box. The powder coat finish resists rust, but some users report chipping after prolonged exposure to road salt. The recessed paddle handle is easy to use and provides good security. Installation is straightforward with pre-drilled holes.
We recommend this box for budget-conscious buyers who need a solid, no-frills storage solution. However, if you live in a coastal area or frequently drive on salted roads, you may want to invest in an aluminum box for better corrosion resistance.
- Heavy-duty steel construction with black powder coat finish
- Recessed paddle handle with lock and key for security
- Pre-drilled mounting holes and all hardware included
Pros: Very affordable for a steel box; Sturdy and secure paddle latch
Cons: Paint may chip over time in harsh environments
3. Rugged Ridge 18003.07 Black Side Mount Tool Box: Best for Jeep Gladiator
Our research shows that the Rugged Ridge box is a custom-fit solution for the Jeep Gladiator. It mounts securely to the bed side rails and includes foam padding to eliminate vibration. The low-profile design maintains a clean look. Owner reviews highlight the easy installation and precise fitment.
This box is an excellent choice for Gladiator owners who want a dedicated storage solution. However, it is not compatible with other trucks, so if you own a different make or model, look for a universal option.
- Designed specifically for Jeep Gladiator JT models
- Includes stainless steel hardware and foam padding to prevent rattles
- Low-profile design sits flush with bed rails
Pros: Perfect fit for Gladiator; Easy to install with included brackets
Cons: Limited to Jeep Gladiator only
4. UWS EC-111 Economy Aluminum Side Mount Tool Box: Lightweight Pick
In our evaluation, the UWS EC-111 is a budget-friendly aluminum box that keeps weight low. The brushed finish looks decent, but the metal is thinner than premium boxes, making it more prone to dents. The rubber gasket provides basic weather protection, but not as durable as continuous seals. Owner feedback suggests it works well for light-duty use.
This box is best for occasional users who need a lightweight, affordable option. If you regularly carry heavy tools or drive off-road, consider a heavier-duty model for better durability.
- Lightweight aluminum construction with brushed finish
- Single key lock with paddle handle
- Weather-resistant rubber gasket
Pros: Very light and easy to install; Good value for an aluminum box
Cons: Thinner aluminum may dent more easily
5. Kobalt 72 in. Aluminum Side Mount Tool Box: Spacious Choice
Based on owner feedback, the Kobalt 72-inch box offers ample storage for long items like fishing rods or lumber. The sliding tray is a nice organizational feature. However, some users have noted that the lock mechanism can become sticky after extended use. The aluminum construction is lighter than steel but not as impact-resistant.
We recommend this box for those who prioritize interior space and organization. If you need a lock that withstands heavy use or frequent opening, you might want to upgrade to a model with a more strong locking system.
- Extra-long 72-inch length for maximum storage
- Reinforced lid with dual gas struts for easy opening
- Sliding tray for organization
Pros: Very spacious interior; Gas struts hold lid open securely
Cons: Some reports of lock issues over time
6. TruckCraft 60 in. Diamond Plate Steel Side Mount Tool Box: Budget Pick
In our evaluation, the TruckCraft box is the most affordable option, but it comes with compromises. The steel is thin and the powder coat can scratch, leading to rust. The lock mechanism is basic and some owners report it jamming. The rubber seal is adequate but not as effective as more expensive boxes.
This box is only suitable for very light-duty use or as a temporary storage solution. If you need something durable or secure, spend a bit more on a better-built model.
- Diamond plate steel with black powder coat
- Single lock with key
- Rubber seal for weather resistance
Pros: Very low price point; Classic diamond plate look
Cons: Thin steel may dent easily; Lock feels flimsy
7. Delta III 61 in. Black Aluminum Side Mount Tool Box: Compact Option
Based on our research, the Delta III is a good choice for compact trucks like the Ford Ranger or Toyota Tacoma. The low-profile design does not obstruct rear visibility. The black textured finish hides wear well. However, the interior height is only 9 inches, which may not accommodate larger tools. Owner feedback is generally positive for light-duty use.
This box is best for owners of smaller trucks who need basic storage without sacrificing bed space. If you need to store tall items, look for a box with greater depth.
- Low-profile design for compact trucks
- Black textured finish resists scratches
- Center-mounted lock with paddle handle
Pros: Slim profile fits small trucks; Lightweight and easy to install
Cons: Limited interior height
Frequently Asked Questions
How do I install a side mount truck box?
Most side mount boxes come with mounting brackets and hardware. You typically place the box on the bed rail, align the brackets, and tighten bolts from underneath. Always check the manufacturer’s instructions for torque specs and ensure the box is level. Some models require drilling, but many use existing holes or clamps.
Are side mount boxes secure against theft?
Security depends on the lock quality. Look for boxes with recessed paddle handles and keyed locks. Some models offer cylinder locks that are harder to pick. However, no box is completely theft-proof. For added security, consider using a padlock or installing an alarm system.
Will a side mount box fit my truck?
Side mount boxes are designed to fit specific bed widths and rail styles. Measure your truck’s bed side rail length and width. Most boxes are universal, but some are model-specific (e.g., for Jeep Gladiator). Check the manufacturer’s fitment guide before purchasing.
What is the weight capacity of a side mount box?
Weight capacity varies by model. Typical capacities range from 15 to 30 pounds. Heavier boxes are more durable but add weight to the truck. Always check the spec sheet to ensure the box can handle your tools. Overloading can damage the box or mounting system.
Can I paint or customize my side mount box?
Yes, but it depends on the material. Steel boxes with powder coat can be repainted after sanding and priming. Aluminum boxes can be painted with a metal primer and automotive paint. However, customizing may void the warranty. Some users add decals or bed liner for extra protection.
Our Verdict
After comparing specifications, owner feedback, and build quality, the Weather Guard Saddle Box 1350-0-01 is our top pick for its superior durability and weather sealing. For budget-conscious buyers, the Dee Zee DZ8500 offers excellent value without major compromises.
More Truck Accessories Guides
Video Guide
Video: Related tutorial from YouTube