I've got a set that's the same design, same style wheels, etc. with a different name on them... They work ok for moving cars around, I can move one end at a time by myself, but it's a whole lot better with two people.... My rotisserie has 5" steel wheels, with a body hung on it I can pull or push either end around the shop with one hand. I've never seen a set of the type you referenced that is an easy, one man job to push a car around the shop on--all that mass rolling on what is such a small contact patch on the casters just isn't going to be a one man job with a 4,000+ pound car on them. More to do with rolling resistence then the design of the dollie or makeup of the casters.