📍 18 Clermont Ave, Brooklyn, NY 11205📞 +1 718-802-9888
CTR
Clermont Truck Repair
Brooklyn, NY
What Size Tonneau Cover Do I Need
Tonneau Cover

What Size Tonneau Cover Do I Need

What Size Tonneau Cover Do I Need: Discover how to perfectly match your truck's tonneau cover size with expert measurements and insider…

By Kenny·April 7, 2026·3 min read
This article is part of our tonneau cover article cluster, with 117 more related guides on the site.

Last month, a customer rolled into Clermont Truck Repair with a 2018 Dodge Ram 1500 sporting a tonneau cover that was so misaligned, it looked like it was installed by a blindfolded amateur. The cover was a full 4 inches too short, leaving massive gaps on both sides. When I asked how he'd chosen the cover, he shrugged and said he 'just guessed.' That's when I realized most truck owners have no idea how to properly measure for a tonneau cover.

Different Truck Bed Styles And Why They Matter

In my experience, truck bed styles are like fingerprints - no two are exactly alike. A step-side bed with its unique wheel well contours requires a completely different approach compared to a fleet-side bed.

Each bed style impacts cover fit dramatically. Step-side beds need covers that can handle curved surfaces, while fleet-side beds offer more straightforward mounting options.

Common Measurement Mistakes Truck Owners Make

I've seen three killer mistakes that'll wreck your tonneau cover purchase:

First, measuring over bed rails instead of inside the bed. This adds unnecessary inches and guarantees a poor fit.

Second, forgetting to account for bed liners, which can add crucial thickness to your measurements.

Precise Measuring Techniques

A customer once asked me, 'Kenny, how do I get this right?' Here's my pro technique: Use a steel tape measure that locks, measure from bulkhead to tailgate's inner edge, and always measure twice.

For a 2020 Ford F-150, you'll want to measure with the tailgate both closed and open to ensure total accuracy.

Pro tip: Clean your truck bed first. Dirt and debris can throw off measurements by up to a quarter-inch.

Choosing Between Custom and Universal Covers

The thing most guides won't tell you is that custom covers aren't always worth the extra cost. A well-measured universal cover can work perfectly for many trucks.

For a Toyota Tacoma, a universal cover with adjustable mounting can save you 30-40% compared to a custom option.

Always prioritize precise measurement over brand prestige.

Frequently Asked Questions

How accurate do my measurements need to be?

Within 1/8 of an inch. Anything more can cause fitment issues or potential water leaks.

Can I install a tonneau cover myself?

Most can be DIY installed, but if you're not confident, we at Clermont Truck Repair can help ensure perfect fitment.

How often should I check my tonneau cover's fit?

Inspect annually or after any significant truck modifications. Bed liners, accessories, or minor accidents can alter dimensions.

K
Kenny

Truck repair expert at Clermont Truck Repair, Brooklyn NY. Specializes in diesel engines, fleet maintenance, and heavy-duty truck repairs.

Related Articles

More guides from the Clermont Truck Repair blog

View all →