How to Measure Your Truck Bed
How do I measure my truck bed for compatibility with a WEATHER GUARD® truck box?
To check if a WEATHER GUARD® truck box will fit your truck, you need to measure your truck bed and compare those dimensions to the box specifications. Accurate measurements ensure proper fitment and safe installation.
1. Measure Bed Length
- What to do: Measure from the inside edge of the tailgate (when closed) to the inside edge of the bulkhead (the wall behind the cab).
- Why it matters: Truck boxes are designed for specific bed lengths (e.g., 5.5', 6.5', 8').
2. Measure Bed Width
- Between Bed Rails: Measure the distance between the inner edges of the bed rails.
- Inside Width: Measure the widest point inside the bed, typically just above the wheel wells.
3. Measure Height of Bed Walls
- Measure from the floor of the bed to the top of the bed rail.
- This helps determine if a low-profile or standard-profile box is best.
4. Check for Obstructions
- Look for bed liners, tie-downs, tool mounts, or wheel well protrusions that could interfere with installation.
- Measure the distance between the bulkhead and the beginning of the wheel well. These protrusions limit the effective width of the truck bed—especially in smaller beds—so this distance can prevent a unit from fitting even if all other measurements align. For chest-style boxes, the bottom of the box must be smaller than this measured distance. Similarly, extra-large saddle boxes (deep, wide, etc.) may not fit if the wheel well is too close to the bulkhead.
5. Note Your Truck’s Make, Model, and Year
- Fit guides are often specific to these details, especially for newer models with aluminum beds or unique rail shapes.
Pro Tip: To determine whether a WEATHER GUARD® truck box—such as a saddle box or all-purpose chest—will fit your specific truck make and model, the best approach is to use the official WEATHER GUARD® Truck Fit Guide. Also, our website’s Year/Make/Model selector allows you to input your truck’s year, make, model, and bed size to find compatible products.