I'm presently going through a similar situation, trying to squeeze 4 into the size of 3 until my 4-post arrives. I bought the exact dollies pictured from HF, and while they do work, it's everything I can do to move the car around. My floor is about perfect, but the casters don't swivel as easy as they could, and I had to use a rubber mallet and tap each caster (16) into position, then push, then tap, then push. If I were going to do it over again, I'd invest in a better set, but hopefully I won't need them much longer.
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