From the manufacturer
Rated for 6000 Pounds
If you are in the market for a car dolly or a set of tire skate, stop looking! These commercial quality skates feature top grade steel, the most robust 3" castors available, and quick and easy assembly. Our skates have ball bearings on the swivel (which all casters have) and on the axle shaft. It rolls with less than 1/2 the force of a standard caster.
Today's technology housed in a robust design will provide you with years of service.