I have a new design (that works in my head) for v2, the second tractor, which brings back the (almost) zero-fitting sleds from v0, hopefully making it easier to move. If this doesn't work, I have a plan for adding wheels to v1(.1)
Also, why do people call these things "tractors"? Chicken tractor, bunny tractor, etc.
I don't know a better word, but I don't think "tractor" is fitting.