A friend of mine wanted a ladder rack to haul boats on top of his Flip-Pac pickup topper. The tricky part is that the top of the topper flips forward and becomes a tent. There is no commercial rack made that is compatible with this topper, so he asked me to make one. This one has a rear rail that extends past the back of the topper, and the front rail is removable.
I did not want to break my back maneuvering the rack on and off his truck, so I made up a system that will let a single person move the rack into position. It is a bit awkward for a single person, but will be very easy for two. I basically move the rack a little at a time, and then set it on a platform behind the truck.