When I was regularly taking my car to the track, I always took it on a trailer because I expected it to break down. I've experienced
oil pump failure, broken pistons, clutch failure and fuel line vacuum lock due to an overheated fuel pump. As I fixed each problem at the source, it became more reliable and has not broken down in several years. The only break down not on the track was when some debris got into the shifter and locked it up between gears.