Marc,
Bought the cart from Autotwirler
https://www.autotwirler.us/ made in Indiana. In fact, when I picked it up they needed to weld up a couple additional pieces and they were hot off the welding fixture.
Each body mounting point is adjustable left / right, up / down, and fore / aft. Initially bought it to support the '35 Chevy body due to its wood structure and it should work well for the 'Burb.