RetraxPRO MX vs Roll-N-Lock M-Series: Which Retractable Cover?

If you’ve settled on a retractable cover, the choice usually comes down to Retrax or Roll-N-Lock. Both slide into a canister at the cab, both lock with a key, and both cost close to $2,000 for a full-size half-ton. The RetraxPRO MX has aluminum slats, a published 500 lb rating and a lifetime warranty. The Roll-N-Lock M-Series answers with a much smaller canister and, in its XT form, T-slot rails built in.

We haven’t tested either cover ourselves. Specs come from the maker copy on Amazon and the retailer etrailer, prices are what Amazon showed on November 12, 2026, and the only hands-on retractable test we found (Car and Driver’s) covered a different brand, so we use it as evidence about the category, not about these two covers.

The short answer

Choose the RetraxPRO MX for the best-documented package: 500 lb aluminum slats, a key lock that holds at any position (maker claim), a limited lifetime warranty and more owner reviews. Choose the Roll-N-Lock M-Series if every inch of bed matters or you want T-slots for a rack without buying a separate rail system. On some trucks the Roll-N-Lock is also the cheaper one, so price your exact fitment.

Spec by spec

Prices for the same trucks

Amazon prices on November 12, 2026. The Retrax was about $83 cheaper on the F-150, while the Roll-N-Lock was about $450 cheaper on the Ram and $300–$500 cheaper on the Tundra. The plain (non-XT) M-Series F-150 5’7” listing we found had no buy-box price when we checked, so we’ve listed the XT. Check today’s prices: RetraxPRO MX, Roll-N-Lock M-Series.

Canister size and bed space

This is the biggest practical difference. Every retractable needs a canister at the cab end to hold the slats when the cover is open, and that canister sits on the bed floor, so nothing can use that space.

Roll-N-Lock says its M-Series canister is 7-1/4 in deep, which it calls the most compact of any retractable. etrailer lists the RetraxPRO MX canister at 13-1/2 in deep by 12 in tall; a staff answer on the same page gives 11-5/8 in tall by 13-3/4 in. Either way, plan on roughly a foot for the Retrax.

On the 67.1 in floor of a 2021+ F-150 5.5 ft box, that’s about 60 in of usable floor with the Roll-N-Lock and about 54 in with the Retrax. On a 6.5 ft or 8 ft bed the canister takes a smaller share, which is why retractables make more sense on longer beds. After eight months with a GatorTrax retractable (a different brand), Car and Driver’s tester called its “12-inch roller case at the bulkhead” “a bit inconvenient sometimes, but not enough to hate it.”

Try your own bed length in the bed access calculator; its retractable row uses the Retrax-size canister, so a Roll-N-Lock leaves about 6 in more.

Opening and closing

Both are manual covers: you release the latch at the tailgate end and push the cover toward the cab, where it winds into the canister. Roll-N-Lock says the M-Series uses a torsion spring enclosed in a 3 in aluminum casing and a patented contoured hinge design for smooth, frictionless rotation. Retrax says its aluminum slats retract without trapping debris that would hinder them. Both are maker claims we couldn’t check against a test. In practice, the reason people pay for a retractable is that there’s nothing to fold, strap or lift off: you can open part of the bed for a bag of groceries, close it again and lock it in seconds.

Security

Both are keyed covers, which puts them at level 3 on our security scale: they stay locked even if the tailgate is open. Retrax says the PRO MX locks with the key at any position along the rails, so you can leave it partly open for a ladder and still lock it. The Roll-N-Lock listing describes key and tailgate locking.

One caution from testing: Car and Driver’s tester couldn’t get the GatorTrax retractable to lock anywhere but fully open or fully closed, despite an “any position” claim. That’s a different cover, but it’s worth trying the partial-lock positions on yours soon after install.

The Retrax’s aluminum slats are harder to cut than the Roll-N-Lock’s vinyl top, though the M-Series has an aluminum undercarriage beneath the vinyl. Our most secure tonneau covers guide explains the security levels.

Weather sealing

Neither cover has an independent water test. Both rely on drain tubes from the canister, routed through the bed’s drain holes, and that routing matters: Car and Driver found water got into its GatorTrax retractable at the cab-side corners and from the canister, and noted that installing a drain hose meant drilling through the bed. An owner review on etrailer says the RetraxPRO MX isn’t watertight in heavy rain or a car wash. Plan on a bed mat and keep valuables in a sealed box; are tonneau covers waterproof? explains why.

Bed racks and T-slots

If you want bars or a rooftop tent over the bed, the Roll-N-Lock M-Series XT has MaxTrak rails that, per the maker, accept most T-slot accessories from Yakima, Thule and Rhino-Rack. Retrax sells T-slot (RTT-) and XR rail versions of the PRO MX. With standard versions, a rack on its own rails, such as the Thule Xsporter Pro Shift on TracRac SR base rails, is the usual route; Thule’s listing says it’s compatible with retractable covers and points to its fit guide. etrailer’s Q&A says the Yakima OverHaul HD isn’t compatible with the Retrax MX. More in tonneau covers with a bed rack.

Warranty and owner record

Retrax backs the PRO MX with what it calls a Legendary Lifetime Guarantee (a limited lifetime warranty). Roll-N-Lock’s listings show 3 years. Owner feedback on Amazon is thin for both, thinner for Roll-N-Lock: the Retrax’s Ram 5’7” listing had 168 ratings averaging 4.4 and its F-150 listing 22 at 4.8, while the Roll-N-Lock F-150 XT listing had 3 ratings and its Ram 6’4” listing 6 averaging 3.2.

Which should you buy?

• Most retractable buyers: RetraxPRO MX, for the load rating, warranty and larger owner base.
• Short bed, every inch counts: Roll-N-Lock M-Series, for the 7-1/4 in canister.
• Rack or rooftop tent planned: Roll-N-Lock M-Series XT, or a Retrax T-slot version.
• Ram 1500 or Tundra owners: compare prices carefully; the Roll-N-Lock was several hundred dollars cheaper when we checked.
• Want the Retrax lock for less: the RetraxONE MX uses polycarbonate slats rated for 200 lb and cost $1,549.99 for the F-150.

Still deciding whether a retractable is right at all? Compare types in tri-fold vs roll-up vs retractable, or see every option in best retractable tonneau covers.