I've tried a few things similar on my truck. Currently, I'm building a low-pro cage, but the Thule Xsporter works nicely for rooftop tents, assuming you don't have a canopy. At its lowest, the RTT barely clears the cab, keeping center of gravity down and there's still plenty of room for gear boxes underneath. With the RTT off and the xsporter up, you can easily and securely haul lumber and ladders. Super stout unit, all aluminum extrusion, and relatively affordable. Oh, and if you hate it, they hold their value on CL.