Now the problem is, I'm worried that the middle of the unit where all the weight is, isn't supported, and it'll start to sag and something will get damaged or snap.
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I'm worried that bar across the bottom isn't strong enough to take all the weight pushing down in between the casters.
In hindsight, I think the mobile base, with some plywood, is really the best choice. Physically I just can't deal with that right now.
I did the next best thing and cut and notched some 2x4s to size that I can hammer in place and have them take the weight in the middle.
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When I want to move the move the tire machine again, two kicks to get those blocks out of the way, and I can wheel it around again.
The alternative was to get some metal bars cut to size and drilled and run those in that channel under the bottom, to help support the weight in the middle... that's probably a lot better and tidier looking... but it was 10 PM, stores were closed, and I already had 2x4 so, for tonight, good enough.
My wheeled tire changer is so practical, but also so far from perfect... so I might still return the casters and just get the mobile base when I'm ready to deal with big sheets of plywood again.