Roll-N-Lock LG221M M-Series Tonneau Cover
Our LG221M M-Series tonneau cover brings retractable aluminum protection to full-size truck beds with a low-profile design that sits flush when closed. The cover retracts into a compact canister behind the cab, giving you instant access to the entire bed without removing panels or lifting heavy lids.
Built with interlocking aluminum slats, the LG221M locks at any position along the bed rails, so you can secure partial loads or open the bed completely in seconds. The integrated key lock prevents unauthorized access, and the canister housing mounts inside the bed without drilling into your truck's finish.
LG221M specifications
Aluminum slat construction and canister design
The LG221M uses interlocking aluminum slats that retract into a powder-coated canister positioned just behind the truck cab. Each slat locks into the next, forming a continuous surface that resists prying and distributes weight across the bed rails. The canister sits approximately 12 inches from the front bed wall, leaving the majority of your bed floor clear for tall cargo.
When you need full bed access, the cover retracts completely in under 30 seconds—no tools, no panels to store in the garage. The M-Series lineup shares this same slat-and-canister architecture across multiple truck models, so the core mechanism remains proven and field-tested. The aluminum construction resists rust and corrosion, even in salt-spray climates or heavy rain.
Installation and truck bed compatibility
The LG221M installs with clamp-style mounting brackets that attach to your truck’s existing bed rails—no drilling, welding, or permanent modification required. Installation takes about one hour with basic hand tools: a socket set, Allen wrenches, and a tape measure for rail alignment.
This model fits specific full-size truck bed lengths and rail configurations, so confirm your truck’s year, make, model, and bed size before ordering. The clamps adjust to accommodate slight variations in rail width, but the canister length is fixed to match the LG221M’s designated bed size.
Locking mechanism and security features
The LG221M includes a dual-lock system: a rotary lock handle on the driver’s side rail that secures the cover at any position, and a keyed cylinder lock that prevents the handle from turning. You can lock the cover fully closed, partially open at a specific position, or fully retracted—giving you flexibility to secure different load sizes.
The key lock uses a tubular cylinder that resists picking better than standard wafer locks. We include two keys with each cover, and replacement keys are available by contacting us with your lock code (stamped on the cylinder housing).
More M-Series truck bed covers
Rated 4.8 by verified buyers
Common questions about the LG221M M-Series
The LG221M is designed for specific full-size truck models and bed lengths. Check the fitment chart on this page or contact our team with your truck's year, make, model, and bed size. The cover requires standard side rails; aftermarket rail systems or bed liners with raised edges may interfere with the clamp brackets.
Yes, the Roll-N-Lock LG221M retracts forward into the canister, so you can open it with the tailgate closed or raised. This is useful when you need to access front-bed cargo without fully lowering the tailgate in tight parking spaces.
The LG221M is water-resistant, not waterproof. Rubber seals along the rails and between slats block light rain and road spray, but heavy downpours or direct pressure washing can allow water inside. For moisture-sensitive cargo, we recommend using secondary weatherproof containers or tarps.
The canister occupies approximately 12 inches of bed length behind the cab. When the cover is fully retracted, the canister remains in place, so your usable bed length is reduced by that 12-inch section. Measure your typical cargo to confirm this won't interfere with long loads.
Bed extenders that clamp to the tailgate or sit inside the bed typically work fine. Cargo racks or crossbars that mount to the bed rails may conflict with the LG221M's clamp brackets. Verify mounting points before purchasing aftermarket bed accessories.
You'll need a socket set, Allen wrenches, and a tape measure. Installation takes about one hour and requires no drilling or permanent modifications. The clamp brackets adjust to fit your truck's rail width, and all hardware is included.
The no-drill clamp installation does not modify your truck's body or frame, so it should not affect your manufacturer's warranty. If you have concerns, consult your dealership or review your warranty terms before installing any aftermarket accessory.