If you want to flip something with wheels, there's more money in motorcycles. Buy during winter/sh**ty weather season, sell when weather is nice. There are also a lot of numpties who get bikes, don't know how to work on them, and unload them cheap. Picked up an old Honda that way. Bike "wasn't running" after the seller pulled the carbs to replace a cracked intake boot. I had the seller sign over the title, put a tag on it, popped the petcock vac hose back on, and rode it home. The look on his face was priceless.

Be careful, buying or selling more than a certain # of vehicles per year may require a dealer license, or at least creativity with how the titles are signed over...