I do. I have a high top camper shell with a kart rack that sits on top of the bed rails, made out of wood, that serves as a platform for a second kart. I made some ramps that allow me to roll the second kart up onto the platform. I have an 8′ bed though. If you have a shorter box and no camper shell it may be a little more difficult to build a similar setup to mine, as the shell provides the bracing for my platform and the extra bed space provides the room I need for the ramps and to store taller items.