All of my implements are on homemade dollies, each custom designed for that specific implement. Due to clearance, I had to use 2" casters on the MMM dolly. The thing is, with a lot of weight, you have to use more of the small casters. The smaller casters have more frictional resistance than the bigger ones, and when you add the resistance of numerous axles together, it becomes more difficult to push the thing around. Also, steel casters tend to have a lot less resistance than the rubber or harder phenol wheels do. The bigger and fewer the wheels, and steel over rubber/phenol, makes the mass much easier to push around.
My backhoe on 5" steel wheels is immensely easier to push than my MMM on 2" wheels, and the bh weighs 3X as much.
I built a small sled dolly for my barbell weights that I use as implement
ballast. In order to roll this sled beneath the box blade (which is on 6" casters), I put 1 5/8" casters on the sled dolly. It rolls not much better than if I were just to slide it on the ground.
Not to pick on anyone for their spelling, but I got a good laugh at the spelling c-a-s-t o-r. Made me think of being a kid and being forced to swallow that nasty castor oil. Even sounds like something you do to male piglets.
