One of my fears is that I would get tired of swapping the work box and the camper around. A trailer would work but I go to several different locations a day and it would be a real pain to have to move around. That, and with the commercial vehicle laws here, the weight of the trailer, camper, and truck would have to be added together and be under the registered GVW. Wouldn't work for me.
Probably go with electric jacks and adapt them to work on both box and camper, fab up another trolley, and finally, get myself an battery powered walkie to move the units around with. Having the driveway on a slight incline is a problem since I'm not heavy enough to stop a loaded trolley from rolling into the garage door. Ask me how I know.......