I purchased a FoldACover bed cover. This cover works very well if you want the security of a cover that locks the tail gate, assuming you don't have a "V" gate, and locks your bed down when not towing the 5er. This is a hard cover that folds in quarters (full bed) or thirds if (short bed) and stacks up behind the cab while towing. I have no problem with my Reese hitch when I close the cover. The cover is hinged fore and aft with locking latches to allow you to access the front or rear of the bed. You can find it at
www.foldacover.com.
I purchased one for my full bed Chevy Silverador for $555.00 with free shipping in June. I noticed it is going for $569 now with free ground shipping through
www.truckaddons.com. This is who I purchased mine through.
Installation was a simple two hour process that I managed to do in one evening.