Might try the rotor idea. Would need to make the drive rotors on either side of each gantry arm on a group and set up some hotbar options for control, but it should work. Yeah, you're right in that I should have said 'sufficiently rigid' as if you set it too stiffly it will explode. Wheel suspensions are pretty stable. As mentioned above, cranking up the stiffness and forcing 1-2 wheels to do all the stabilizing... can lead to boom. If you spread out the load over more suspensions, there's less load on any given area, on both grids, which can lead to you being happier all around. (Repairs are a *CENSORED* on some of those moving devices)
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He started a company, Softwheel, in 2011. He found support in life sciences firm RAD BioMed Accelerator Group, based in Tel Aviv. With RAD's state-of-the-art facilities at his disposal, Wolf built a team of engineers and designers. Soon after, his product, the Acrobat, was born. The Acrobat is a shock-absorbing wheel invented by Gilad Wolf and his team at Softwheel.
Curve & Curve L are a high quality, ergonomic push rim designed and made in Germany. These are available in two sizes: ‘Curve L’ for a larger hand, or ‘Curve’ for smaller hands. Designed for wheelchair users with complete hand function.