I only use one, however the cars are no longer bullit proof and made from cheaper materials so makes sense having a back up. The question is this, how would you feel if your chassis got messed up and you needed to do a gearbox replacement, and more so waste time doing that in the rain or put it in the boot of your car and pull out your spare. Even at the worlds they do that but yes you have to get it checked and signed off first
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