Having a car involved changes the character of a tour drastically. For me the change is likely to be for the worse. For one thing, you will be very likely to have way less interaction with the local folks.

I guess it depends on the individuals and the tour, but on a long tour through very rural areas and small towns it would be a real drag for the sag driver. I know that we were pretty close with a couple that were doing this and it was a real strain on the driver. She had the patience of a saint and it was still a strain.

On the other hand if traveling to places where there are resorts and interesting stuff every day maybe the driver might be happier. The thing is that in those places I would rather not tour and would prefer to just do day rides from the base camp/room.

For me the inability to stay in hiker biker sites, church yards, and town parks would be a big minus. You said you would be credit card touring so that might make it a better fit.