Casey, I would`nt use these casters, Chinese junk, will not hold their rateing. ask me how I know. RedFish, where can I get me one of them there timemachine doohickys, 2010?8)
The casters are kind of a lack of options.
I need pneumatic tires right now and they seem to work fine on the car dolly that was built for the car.
The car is on the dolly now - the car still has the rear end, transmission and k-member under it and they work fine.
One thing that I did do that could have made a difference was seal all of the tires with slime tire sealer.
I felt it would not hurt the tires because they would never see 3 mph anyway.