Measure the route the tarp actually travels. Body width plus bow height is not the tarp width, and body length alone is not the roller-to-rear fabric length.
A dump tarp is part of an operating system. Roller location, bow arc, tailgate geometry, side rails, pockets, axle, and attachment pattern all matter.
How to measure a dump body
- Park on stable ground, lower the body, isolate power, and follow the equipment maker’s procedure.
- Measure roller attachment to rear landing point along the centerline.
- Use a flexible tape over the highest bow from rail to rail.
- Record front cap, tailgate, pocket, axle, and hardware clearances.
- Compare the old attachment pattern, but do not trust a stretched old tarp as the only template.
Measure over the bow arc
A flexible tape laid on the real arc gives the direct width path. Extra hanging material is not harmless: it can flap, abrade on rails, interfere with moving parts, or enter traffic.
Replacing fabric in an existing system
Identify the manufacturer, model, body dimensions, roller direction, and attachment method. Confirm whether the listed size is cut or finished. Generic fabric also needs suitable seams and reinforced connection areas for that system.
Do not size from the truck model alone
Bodies and aftermarket tarp systems differ on otherwise similar trucks. Measure the installed body and system.
Operation and cargo safety
- Keep clear of springs, arms, rollers, and stored energy.
- Do not climb on unstable loads or raised bodies to measure.
- Repair loose fabric before it can reach wheels or traffic.
- Use a separate cargo-securement or containment plan required for the load and operation.
Cargo-securement reference: FMCSA Cargo Securement Rules.
How this guide was prepared
We separate geometry and unit conversions from product claims, use exact standards where available, and flag specifications that vary by manufacturer. See our editorial policy for the review process.