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I wonder if an in-line ski-track-ski configuration would be best, with both skis for steering.
It seems like the longer and skinnier the setup the more you'd need things to be segmented (more skis and/or tracks) for both steering and suspension. Basically it would be immitating a snake in a way. I'm not sure where the practical limit ends, but like I said, a ski-track-ski might be feasible.
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