OP, one note on the folding tonneau covers. There are generally 2 approaches to installing the tonneau. There are those where you add rails to the bed (takes up about 1.5" on each side), but the cover sets "into" the bed. So you still can use your bed rails and install strap hooks or even the steel rails that go over your bed rails if you have use for that, or even a ladder frame. Then there are the folding units that go "over" the bed rails, hence with those tonneaus you will not be able to utilize the stake pockets for strap hooks or add rails over your bed rails if you have use for that. Undercover and Bakflip both install into the bed. I believe the extang units install over the bed rails. I'm not sure about the other units.