Thanks! I wasn't sure if the 2x2's would be stout enough, but it seems fine. I had to do a pitstop on it today though, one of the casters lost a huge chunk of rubber. Jacked it up with the floor jack, swapped it out, all good. I'm willing to bet these casters are 50+ years old. My mother and father-in-law stopped by yesterday and saw this setup, and both got smiles when they saw I was using Bill's old stuff :)