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I am making a tank. a tank has treads. however I cannot seem to be able to get treads(bits of gears connected by axles) working without them 'sliding' off my gears or piling up on one side. could someone teach me how to make working tank treads? thank you

This is really late, but better than never:
I would recommend giving the treads a little highter frictionn ,so they don't instantly slip off the chains. Then maybe change the chains and treads so, that they are able to get between the tank chains or something, to break them. If you need hazards that are harder to drive over, simply try to make fixed piles of highter-friction obejcts with an angle not to high, as the tank still has to get around them.
Maybe you could use some scripting too if you can do this. If you are, tell me, if not, I can teach you something.