I bet that camper sits very firmly on your dolly without any shimmy or sway.
The dolly is made from 2" x .120 wall square tube and 1" X .090 tube for the lower shelf & diagonal bracing. It could easily support twice the weight of my TC... there is
zero "shimmy or sway" ('cept for the fact that the casters can roll) ;)
What would you do different if you were building another? Would you go with non-swivel casters on one end?
I had plenty of time to think about my needs and the design of the dolly before I started cutting up the steel... Given my storage situation (busy/crowded warehouse, flat & level concrete floor, high ceiling), I can't think of anything at all that I'd change.
Since in need to maneuver the camper into the back corner of the warehouse, I wouldn't choose fixed casters, but I would certainly consider using casters with a swivel lock.
-Mark