How is that going to be lifted up onto the truck? How much does it weigh?
When it was still a bare frame on the truck bed, air bags lifted the truck and legs were inserted into the corners of the camper. (You can see two of the holes in the photo.) Then the air bags were deflated and the truck drove out from under the camper. Then pallets were stacked under the camper and jacks were used to lift and lower, lift and lower, removing layers of pallets. That took several guys. So some reverse version of that will get the camper back on the truck. In theory.