Our team always builds fully-modular drive trains so that if anything fails spectacularly, we can have it entirely apart, replaced, and put back together in a short timeframe.
We have a bot with Rhino Treads this year and we didn’t change our drive train plan at all. We still have two fully-modular drive pods so that if we break a belt, it comes apart, is replaced, and goes back onto the robot with ease.
You can see the insides of one drive pod in a picture here.
Our tank system is plug and play… well theoretically. We should be able to swap out the entire tread in the queuing line (though I hope it never comes to that). Actually replacing the belt might take 1/2 hour to an hour later though.