I have a BAK FiberMax G2 4-section and love it. Installed easily by myself and seals very well. For towing the 5er, I have the back three sections rolled up on the front one and there's lots of clearance. I couldn't see the top of the hitch plate in the rearview mirror anymore but I put a piece of aluminum tape on the leading edge of the folded bundle that's exactly inline with the pin slot when seen in the rearview mirror and it works perfectly. Can flip them all up to the back of the cab and only lose about 4 inches of opening - great for hauling bulk material like 2 yards of mulch that they dump in by front-end loader. I got the FiberMax because its claimed the snow and ice doesn't stick as much as with aluminum and they're right.
2015 Rockwood Signature UltraLite 8282WS Platinum, GY Marathon LRD, TST 507RV TPMS
2005 GMC 2500HD CCSB D/A, Curt E16, Prodigy P2, Garmin RV760LMT w/BC-20 b/u cam