Why not just get the lower price units?  For the price of getting 4 vehicle dollies, and jack up the wheels, you can only buy ONE of the fancy units.  Save you money for body work tools!
Ref: 1500 Lbs. Capacity Vehicle Dollies 2 Pc

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1500 Lbs. Capacity Vehicle Dollies 2 Pc

Amazing deals on this 1500Lb Vehicle Dollies 2Pc at Harbor Freight. Quality tools & low prices.
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    On Sunday, September 8, 2019, 06:20:31 p.m. EDT, Karl Ploessl <karl.ploessl@GMAIL.COM> wrote:  
 
 so I finally decided to work on the body of my 81 Vanagon Jenny Westy. It
will take months, years LOL. To move her around in the garage I got some
wheel trolleys (
https://www.harborfreight.com/search?q=5200%20Lb.%20Max%20Vehicle%20Weight%20Ultra-Mobile%20Self-Loading%20Dolly).
Is it ok to have the wheels on these trolleys for months (tires have ~ 200
miles) or better on wooden board or concrete?

Karl.