My top has a drivers side window that opens on the side. I built a flat shelf that goes across from one side of the bed to the other out of 1" X 2"'s and plywood. I had an old back packing ground pad that I cut and glued with gorilla glue. I ended up putting a piece of 1" X 2" across the edge to keep stuff from falling off.
I can open the side glass and lay two bows across, or guns, fishing poles, etc., and still have all of the storage space in the bed underneath it. Works great! I can throw camping gear, tree stands, dead deer, whatever in the back of the truck and my bows are still up above it all and protected.