Quoted from Niterider:I had this style of rolling bed covers before on a previous truck that I owned. It had a latch at the back that you could lock basically turning the entire truck bed into one huge trunk as you had to open the cover to be able to open the tailgate.
The cover would roll up on a drum located just behind the cab. Everything was contained below the bedsides.
Iām tempted to put another one of these on my current truck. It did come in handy at times.
Thats a Roll-N-Lock cover. I have one on my 2013 F150 crew cab, making it the perfect EM pin hauler. I say EM because with the head removed, the F150's bed is deep enough to fit even late 70's Gottlieb cabinets with the cover rolled closed (you'll have to remove the "neck" from the cabinet, which is the small rectangular piece the head sits on). The older 60's wedge head EM cabinets fit easily, with the head units riding inside the cab.
The Roll-N-Lock covers are well built and completely water tight. I take mine through the car wash and there won't hardly be a drop inside. The cover can be latched/locked in several positions. Works very very well for hauling a couple EM's.