I researched bunches of rotisseries to sort our something to meet my needs. Since this is the latest rotisserie thread I'll add mine here. My requirements were - cheap, no weld & has to roll easily over a 1" lip on my garage floor.
I bought 2 harbor freight cheapo engine stands and cut off the uprights. I cut down some 2x4 wood to just fit very tightly into the engine stand upright. Then drove the wood home until flush on the bottom. Mounted to a 2x6 using 2 lag bolts. Added some harbor freight large pneumatic wheels, a couple wood diagonals, and then tied the ends together with long 2x4's. I would not use it in an every day shop, but so far, so good.
I used the leftover HF engine stand metal to weld up the mounts for the car.
Thanks a bunch to all who post their ideas on these. It helped me a bunch for my solution.