Geoboy recommended Henry Ford and Greenfield Village. That can now be had with a factory tour (I have never done). I will suggest (as I do with any guests we get) that you plan two full days, one for the museum and one for the village. Parking an RV near there is problematic at best. The TV will do OK.
If you choose to do this, There are three close by campgrounds but only two are full hookup. That is the Wayne County Fair Ground and other is called "Detroit Greenfield" or such and is farther west. I know little of either as they are real close and we never stop that close to home.
I also strongly suggest that you get online and read about what they offer as it is a lot and it is not cheap. It also should not be missed if you have any interest at all.
Matt