I tried this, with mixed results, just like stated above, the jacks are designed to carry the weight of the camper, once you start trying to move it, (no matter how smooth the concrete, how well oiled the wheels,) the jacks just seemed too wimpy for the side movement. In my case the jacks have to be near fully extended to clear the bed of the truck. I tried supporting them against the other jacks front to back but that didn't help for me. When I installed wheel/casters to the jacks i started to have clearance issues.
For me this just wasn't a good idea, everyone has different situation so it may be ok for someone else.