All my tools are on cabinets that I made. Miter saw, belt sander, router table, drill press, and band saw. I put all the cabinets on a 2x4 skid with $5 HF 3" polyurethane swivel casters w/brakes. I roll my tools around my small shop and on nice days I go outside on my deck. To go outside I have to crossover two carpet strips, a carpeted hallway, and a patio door threshold. Have been doing this for some 3 years now with no problems with these wheels either rolling or locking. I think they also make a 4"size.
Thats fine for hobbyist equipment, not gonna happen with a 900# planer though!