Yes, you are right. The fact that it is his wifes car has nothing to do with it. The car would have to have collision on it to be covered.The car is not covered under Michigan Law. He said he had no coverage on it. In Michigan, you have to have PL /PD (property liability and property damage) but you do not have to have COMP & COLLISION. He indicated that "the truck has full coverage the car does not". There is no such thing as full coverage, but people here in Michigan (ala the poster mprest1) take it to mean that the truck has comp & collision but the car didn't. In Michigan, any damage to your car is covered via the comp & collision on your policy. Thus, if you don't have comp & collision, then you do not have coverage. It doesn't involve the truck what so ever!
Michigan has unique / weird Auto Insurance! The minimum Personal Liability is 20/40 and the Property Damage is $1,000,000 for everybody in the state.
Michigan is the only state that offers unlimited medical coverage via your Auto policy. The good news is that if someone is hurt really bad and requires care for the rest of their life they are taken care of. The bad news is that we are all paying for it with our Michigan Auto Insurance Premiums.
I hope that helps!