as for what to put into the tracks to hold it to the ground, i can think of only to practical ways of doing so for this kind of device, both could have issues with prolonged exposure to heat and flame. the first would to have a wheel pattern like that if a tiger tank, have the wheels stagger from front to back from one wheel to the next. this patern would give you the most contact to the ground and less likely of the front lip of a step going up between the wheels causing for a hard and bumpy ride or possibly even getting somewhat stuck. the other idea is to use something like delron gliders in place of the wheels as this would give a long, flat surface with no chance of getting hung up on the step lip. again, both are prone to heat and flame damage after a period of exposure. chris
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