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There called Go Jacks We use to use them for our Repo Business. Try the towing companies. I use to get a magazine from AW direct. try them. I did find this link with a quick google search. Dont go cheap the cheap ones really suck.
How about the solid ones, without the jack mechanism. - You lift each wheel with a floor jack and place the little dolly / 4 wheels under each tire, then you can roll the car around, assuming that you have a smooth floor. -- Much cheaper. - I bought mine at a yard sale, but they are available at places like Harbor Freight etc. -- --