Raising the camper is common with Ford trucks. Some folks put sheets of rigid foam in the bed. Some build a platform out of wood.
I fastened two layers of 2 X 4's around the perimeter of the camper bottom. This created a 3.5 inch void under the camper, which I used to run wiring for the umbilical cord and a PVC drain line from the fresh tank.
These two mods allow:
1. Plug in the camper at the truck's hitch, without using and extension cord.
2. My fresh tank is in front end of the camper. Prior to this mod, draining the tank while on the truck, meant dumping it in the truck bed. Now it runs out the back end.