There are a few misleading things in this thread that should be cleared up.

1) Your home owners coverage does not cover your vehicle, PERIOD. It doesn't matter if the car was parked in the living room when it got hail damage. It doesn't matter if it was stolen from your drive way.

2) You can not get a rider from your home owners to cover comprehensive to your vehicle.

Sorry Matt, your car is not covered for the damage unless you carry comprehensive on your auto policy.

What Sniper and Jim are thinking about is that some insurance companies will allow you to share the HIGHER deductible between your home and auto insurance, IF, you have both your home and auto with the same company, and IF, both your home and auto were damaged in the same event, such as a hail storm, tornado, fire, etc.