What parts to have spare before going on track?

i usually bring 2 sets of tires, a set of arms,front and back, bearings because they go out at weird times , like my mbx5t, i had a ceramic diff bearing that worked just fine, when i was driving , at the end there was drag ,then when i came off the track the rear diff housing melted and the bearing seized up like a rock. ceramic bearings are nice, but unpredictable in my experience.