The smoothness and levelness of your floor makes the biggest difference. My experience was not good, but my floor is poor.
Mart.
I was considering these. Thank you.Here's something to consider if $$$ is not a deal-breaker...click the link! DD
http://www.summitracing.com/search/...SortBy=Default&SortOrder=Default&autoview=SKU
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I don't know what the weight difference is between a '34 Ford and a '68 Corvette (maybe 500 pounds?), but I have a set of Harbor freight units under my Corvette, and it takes 2 men and a boy to move it around. Make sure you have ball bearings on the casters AND swivels. The only way I can make it change direction is to use a large set of channellocks to turn the casters in the direction I want to go. I would agree that quality is important and spending a bit more may be a good idea.