A proxy race would not require any traveling. A few guys on here would host a race, get say 5 total tracks. Every one sends their cars to the first race. The cars get mailed from race to race. The track owner chooses how the race is set up.
If you go on Home Racing World or Slot Car World there are usally 3 or 4 different proxy races being set up at a time. It can be done with any type of model car racing.