Delivering pizzas.

Built 2 rally cars that way.

You can work at two shops are once. Choose local ones. $20/hour cash usually as long as you aren't working for dickbag Papa John.

Cruise around listening to Metallica, delivering people hot fresh pizzas. No stress. Plus if you live where it is winter the nights you're the busiest, are also the nights where everyone is off the roads. So you can enhance your loose surface skills while making $$.