You never know when your car may be the one dropped by your son as he shows off his handiwork. Have a derby tool kit handy. It should include superglue, sandpaper, a drill, extra screws for your weights, extra weights, a small screwdriver. You may not use it, but it will make you the most popular person at the event. Transport your car in a shoebox.
Dropped cars are unfortunately a too common experience.
Your son can color the box to look like a mechanic's garage. Add LOTS of graphite right before check in. My car is hung up on the race track. The darn thing won't move up or down. If only I'd followed instructions.