Roll-N-Lock M-Series vs RetraxPRO XR: Bed Space or Rack Rails

The Roll-N-Lock M-Series and the RetraxPRO XR are both locking hard retractables: aluminum slats that slide into a canister at the front of the bed, keyed latches and drain tubes out of the canister, and RealTruck sells both. The M-Series wraps its slats in vinyl, rolls itself into a canister about half the size on a torsion spring, and latches in three positions. The PRO XR uses double-wall aluminum slats with T-slot rails the full length of the cover, locks anywhere along the track, carries a 500 lb evenly distributed rating and a limited lifetime warranty, and gives up roughly a foot of bed to its canister.

On our scores they finish a tenth apart, too close to name a winner. The M-Series edges ahead on water and value: its owners lean toward a dry bed on a short record, and it cost noticeably less on all 12 matching listings we compared. The PRO XR leads on durability by more, on the strength of its aluminum slats, a five-year record without leaks or rattles, and Retrax's habit of making problems right.

Buy the RetraxPRO XR if a rack, bikes or a tent will ride on the cover. Its rails run the full length, its latch closes down on a load that sticks out past the tailgate, and RealTruck backs it with a limited lifetime warranty for the original buyer. Buy the Roll-N-Lock M-Series if nothing goes on top and the front of a short bed counts: it keeps about 5 in more floor, costs noticeably less, and rolls away on its own when you twist the latch. With either one, lock the tailgate separately.

Bed space or rack rails

The canister is what the PRO XR's rails cost you. RealTruck lists the M-Series canister at 7.25 in deep, but another block on the same page says 8 in and neither says which way it's measured, so go by the owners: they put the M-Series' bite at 6 to 8 in, where a PRO XR's runs 12 to 13 in. If the M-Series takes 8 in off the front of a Maverick's 54.4 in bed, you keep about 46 in of full-height floor, against about 41 in behind a 13 in canister. On a 14th-generation F-150 (Gen14) short bed of 67.1 in it's about 59 in against 54. That's about 5 in more floor on either truck, and on a bed this short you'll use it.

Neither canister wastes the space under it. Under an M-Series XT's canister on a Ram 1500 (DT) there's about 13 3/4 in of height over a rubber bed mat. A PRO XR's canister measures about 12 by 12 in on a Tundra and leaves about 18 in of height underneath on a fourth-generation (2024 on) Tacoma, enough for camp chairs, a short tote or tie-down straps. Not everyone can live with the bigger one: one PRO XR owner pulled the cover, sold it and ordered a fiberglass topper, because even with a drawer system the bed had lost too much space.

For a rack, the PRO XR is the stronger base. Its T-slot rails run the full length of the cover, and RealTruck says they accept racks, crossbars, cargo holders and tents. The standard M-Series has no rails. The M-Series XT adds two T-slot rails for Yakima, Thule and Rhino-Rack accessories on cross rails bought separately, and even the XT costs less than the PRO XR on all five beds where we confirmed both. Neither maker publishes a rack, T-slot or on-road load limit. The PRO XR's 500 lb is weight spread evenly across the closed cover, not a rack or rooftop-tent rating, and RealTruck's M-Series install sheet says to place nothing on or against the cover. Before a rack or a tent goes on either one, get the limit in writing from RealTruck and the rack maker.

Go easy on the rack hardware with either. Two PRO XR owners bent the aluminum tracks by overtightening rack bolts, and Retrax shipped one of them replacement rails free, though it said the damage wasn't a warranty issue. Follow the rack maker's install guide, and use a torque wrench and the torque the rack maker and RealTruck give you for these rails, not feel.

What RealTruck publishes for each

RealTruck publishes much less for the M-Series. Here's each cover from its own product pages:

Both clamp on with no drilling for the cover itself on most trucks, per RealTruck, though the M-Series' drain tubes usually need a drill (more on that below). Neither has a published weight. Both warranties cover the original buyer only, so a used cover of either brand comes with none. The M-Series' 3 years also exclude leaks from normal use and end when the cover leaves the original vehicle, which matters if you trade trucks often.

Water, drains and winter

Neither one keeps a bed dry, and RealTruck doesn't claim the M-Series does: its install sheet calls the cover not airtight, and its warranty excludes leaks from normal use. Owners who name the M-Series still lean drier than that sounds. A Maverick came through several strong rainstorms with very little water inside, and a Ram's M-Series XT came out of a car wash with a dry bed. When water does get in, look at the cab end first. On one cover quite a bit came in around the bulkhead after the install, and Roll-N-Lock sent a long rubber gasket that fastens along the cover's bulkhead edge. The record is short, which is why the M-Series has no leak-risk rating from us.

The PRO XR leans the other way. Most covers let at least a little water in, along the side rails first, where water pools in the side channels and runs down under the top, then at the tailgate seam, where the rubber gasket on the cover's back edge is thin. Bad leaks are the exception, and plenty of covers stay dry, including on trucks that live outside full-time in the Pacific Northwest. We rate its leak risk moderate. Setup helps some covers: adjust it to Retrax's instructions, cut the drain hoses to length so they don't back up, and check that every screw is still in the canister.

Both empty the canister through two drain tubes, and both need those tubes kept clear. Route them out of the bed. On the M-Series, RealTruck's care sheet says to check the housing for debris: with the cover closed and latched, two screws release the lid, and RealTruck warns never to let the cover retract while the lid is off. Do it every season if you park under trees. If the bed's contents can't get wet, put them in sealed bins under either cover.

Plan on the occasional freeze-up with either. Freeze-ups after winter washes are the best-known Roll-N-Lock complaint, though the owners who describe them don't say which series, and in very cold weather a Retrax can stick frozen too. Brush snow and ice off before you open either one; RealTruck's M-Series sheet makes that a warranty condition. Don't force a frozen Retrax: Retrax says to tap gently by hand around the perimeter and to use de-icer only in the key lock. On the M-Series, any lubricant in the tracks voids the warranty; wipe a sticky cover's top gasket with 303 on a rag instead.

Latches, straps and the tailgate

Day to day, this is where the two feel most different. Twist the M-Series latch and the torsion spring pulls the cover into the canister on its own, sometimes after a slight push, and you close it with a pull strap. It latches in three positions, and the latch rides at the rear edge of the cover, which puts it mid-bed when the cover is part open. The PRO XR's handle sits at the side, and its latch locks at any point along the track, so you can close it down on a load that sticks out past the tailgate. If a rack's side panel blocks that handle, rig a pull line; a stainless pulley lets you open the cover from the tailgate.

Neither one locks the bed with a single key, so with either cover, lock the tailgate separately. The PRO XR opens with the tailgate shut and locked, so the bed is only secure when the cover is locked with the key. A current M-Series works the same way. RealTruck still advertises a built-in tailgate locking system, but its current install sheets bolt a piece to the tailgate only on the 2005-2015 Tacoma, and never with the XT. On the trucks in our fitment tables the cover latches into its own tracks. The M-Series' key slot has a cover that keeps weather out of the lock.

Wear, shipping and support

The PRO XR has the sturdier record. The aluminum slats feel solid and run smoothly, the longest record is five years on a 2020 truck with no leaks and no rattles, and covers have moved with their owners from one truck to the next. Retrax and RealTruck have a good record of making things right, from free replacement rails to reshipped deliveries. Most of the praise still comes from newer installs, so five years is the long end of what's on record.

The M-Series' record is good and mostly old. Named covers have run three trouble-free years on a 2018 F-150 and on a Maverick and four on a 2010 Tacoma, and a vinyl-topped Roll-N-Lock on an earlier Tacoma lasted ten years with conditioning every other year. The vinyl is the chore. RealTruck ships a bottle of 303 Aerospace Protectant with the cover and says to clean it with mild soap only. After four years on that 2010 Tacoma the vinyl was fine, but the black canister had faded and the rubber inside had shrunk enough that the end caps popped off; Roll-N-Lock replaced them free. Ravens tore the vinyl and foam off one new cover down to the aluminum within weeks. If birds work over your parking spot, the PRO XR's slats have no vinyl to tear.

Inspect either one the day it arrives. M-Series housings have arrived dented, and one buyer needed three shipments to get a usable cover. A PRO XR took three deliveries to arrive undamaged, another arrived with the canister dented and punctured and hardware missing, and a 6 ft 2 in 4th gen Tacoma part ordered from RealTruck still hadn't shipped after more than a month.

Installing them: clamps, drills and tie-downs

The PRO XR is the simpler install on paper. RealTruck quotes under 60 minutes with four clamps and no drilling for the cover itself, and one Tundra had the cover on in about 20 minutes and everything done in 45 to 60 once the final adjustments were finished. The drain tubes are the variable: some installs set them by the weep holes without drilling, and others run them through holes drilled in the plastic plugs at the front of the bed.

RealTruck publishes no install time for the M-Series, and the job usually involves a drill. On the F-150 you drill a 1/2 in hole through the plug at the bulkhead for the drain tubes, and the Silverado and Sierra, Tacoma and Tundra sheets also have you drill 1/2 in holes; the DT Ram and the Maverick use existing holes. On the F-150, Ram and Maverick sheets, a plastic drop-in liner comes out, gets cut with a jig saw and drilled, then goes back in. The tracks have to sit square to the tailgate with a 1/8 in gap at the end caps, tightened in the sheet's order. RealTruck warns not to drill through the cab and to rust-protect the holes. If you drill into metal for the PRO XR's tubes, treat the bare edge so it doesn't rust.

Check your front tie-downs before you order. On a Gen14 short bed, the PRO XR's canister covers the front tie-down anchors and the two BoxLink holes closest to the cab on each side, so plan on BoxLink hooks in the outer holes; RealTruck says nothing about BoxLink for either cover. On a Tacoma, RealTruck has the bulkhead tie-downs come out for good under the PRO XR, and its M-Series sheet for the 2005-2023 Tacoma has you remove and discard both front tie-downs. On a Maverick they stay reachable around the M-Series canister. The install guide for your truck governs either way; where it gives torque values, use a calibrated torque wrench.

Which trucks each one is confirmed for

RealTruck builds each cover by truck and bed, and Amazon sells them one listing per fit. We confirmed every Amazon row in the fitment tables on that listing's own product page, with years and bed exactly as the listing states them; search links mark the beds we couldn't confirm, so check fit for your truck on those.

• F-150: both have confirmed 5 ft 7 in and 6 ft 7 in listings for the Gen14 (2021 on) and the 13th generation (Gen13, 2015-2020). The M-Series' Gen13 long-bed listing calls the bed 6.5 ft, and its model number is RealTruck's 6 ft 7 in part.
• Silverado and Sierra 1500 (T1XX): both have 5 ft 10 in and 6 ft 7 in listings that work with the MultiPro and Multi-Flex tailgates; Amazon's 5 ft 10 in short box is RealTruck's 5 ft 8 in. The PRO XR adds a listing for the CarbonPro bed, where we found no M-Series part, and the M-Series adds an 8 ft listing. The PRO XR's 6 ft 7 in listing isn't for trucks with the factory side storage box.
• Ram 1500 (DT): the standard 5 ft 7 in and 6 ft 4 in listings of both covers don't fit the multi-function (split) tailgate. The PRO XR's RamBox listing fits with or without it. The M-Series' RamBox listing says it fits with the split tailgate while RealTruck's note for that part says without, so ask RealTruck before you order. For a DT with the split tailgate and no RamBox, we found a part for neither; the Sentry CT has split-tailgate listings.
• Tacoma: for the 3rd gen (2016-2023), both have a 5 ft 1 in listing, and the PRO XR adds a 6 ft 2 in listing for the Regular, Access and Double Cab. The M-Series listing says it's for trucks without the OE track system or the Trail Edition, while RealTruck's note for the same part names only the Trail Special Edition package, so if your bed has the factory deck rails, get an answer from RealTruck first. For the 4th gen, RealTruck lists 5 ft and 6 ft 2 in parts of both, says the M-Series parts need the deck rail system and lists the PRO XR's 5 ft part for trucks with it; we haven't confirmed any of them on Amazon.
• Tundra (3rd gen, 2022 on): both have 5 ft 7 in listings, and the PRO XR adds 6 ft 7 in and 8 ft, all of its listings for trucks with the deck rail system. The M-Series listing is for the Crew Cab and Double Cab, and RealTruck splits that part by the factory bed liner, LG575M without it and LG580M with it.
• Maverick: both are confirmed, and each listing calls the bed 4 ft 6 in where RealTruck says 4 ft 4 in. Same part either way.
• Colorado/Canyon and Ranger: only the PRO XR has a confirmed listing, a 5 ft Colorado and Canyon cover. RealTruck lists an M-Series part for the 2023-2026 Colorado and Canyon without the Multistow tailgate, and parts of both for the 2024-2025 Ranger; none is confirmed on Amazon, so check fit for your truck with the search links.

Rack or room: where we land

• A rack, bikes or a tent on the cover: the PRO XR, on rails that run the full length. Get the load limit from RealTruck and the rack maker first.
• A short bed where the front matters: the M-Series, with about 5 in more full-height floor than the PRO XR leaves.
• Rails now and then, for less: the M-Series XT, which still costs less than the PRO XR on every bed where we confirmed both.
• Loads that stick out past the tailgate: the PRO XR, whose latch locks wherever the cover stops.
• Birds where you park: the PRO XR. There's no vinyl to tear.
• A cover you might move to your next truck: not the M-Series, whose warranty ends when the cover leaves the original vehicle.
• Cargo that can't get wet: sealed bins under either one, or the Sentry CT, whose owners report a drier bed and which has no canister at all.

Neither wins outright on our scores, and a rack is what settles it. With rails in the plan, buy the PRO XR and give up about a foot at the front of the bed to its canister. Without them, buy the M-Series, keep about 5 in more floor for noticeably less money, and feed the vinyl 303.