Spray all the breakers with cold spray right before the match. Canned air will do the same thing if it's held up side down and sprayed.
Use lots of fans around your motors and breakers
Wrap the main breaker in some foam rubber to isolate it from shock when you get hit by another robot. A sudden jolt can cause it to trip.
You may also want to mount the breaker panel on something soft like a stack of O-rings where the mounting screws are.
If you use 4wd skid steer, design 2 or all of your tires to have traction only in the forward and reverse directions of the robot. Team 599 knows about this.
Too much side traction will cause breakers to trip when turning.