Just carry a spare motor, ESC and belts. If you lose your weapon during a match, just try to win through driving and then swap it out afterwards. Also buy a decent motor as well, will help towards having a reliable weapon system. My original brushless motor was on the go for three years (or three events, depending on how you look at it) and probably would still be going if it hadn't got vapourised in a massive impact. It's a 40-sized Scorpion motor, more expensive than some Hobbyking options but worth it in my opinion. If you scour eBay you can usually get a used one in great condition for about half the 'new' price.