I think I might have read where this was not a good idea.
The fastening points where the jacks mount to the TC are designed for vertical loads not lateral forces that would be present when rolling a camper on jacks.
Imagine what would happen if rolling this setup on nice smooth concrete and there was that tiny pebble that you did not catch as you are applying force to push the camper around.
JMHO.
ON EDIT:
My comment above is for general rolling around (as inside a garage.) I could see theoretically for "dialing in" for loading-on-the-truck purposes it could work, but I think the force-direction concern should be heeded just the same.