A couple years ago I performed a grand experiment, trying to build a camper dolly for my relatively smooth, relatively level gravel barn floor.
My dolly ended up with 10 large pneumatic casters, my reasoning being the more tire I could put on the ground, the easier it would roll. The intention was to be able to move the camper.
It did not work well. First time I put the weight of the camper on the dolly, the front tires went right down to the rims. I needed to add two more casters to the front of the dolly to carry the weight of the front of the camper.
After that problem was solved, I tried to move it. It would not roll because some of the casters were facing the wrong way. The only way I could get it rolling was if I jacked up the dolly and positioned the casters in the direction I wanted to go.
The next spring, all the tires were FLAT. After I aired them up, the camper would not roll. I ended up wrapping a chain on it and tugging it with a tractor to get it out of the depressions that formed in the gravel over the winter. In dragging the dolly, I managed to bend two of the casters.
All in all, it was a failure. I'm not sure what I'm going to do with it now because it's all nailed together and pulling it apart will destroy it.
Putting 10-ply tires on half ton trucks since aught-four.