Can you have two different insurance companies on two different cars that you own?

YIKES! In theory, yes. However, what a mess you are setting yourself up for. For instance: which policy's liability coverage will cover you for your liability when driving another vehicle (ie: rental car, friend's car); which policy's uninsured motorist's coverage will provide coverage in same scenario; which policy will respond when you are a pedestrian and you are injured and your state requires your P.I.P. coverage to pay first? I would NOT suggest you get two different companies!