Need Used Motor Home Help
It sounds as though you are thinking of a class C. If so, you may also want to consider the Lazy Days. It has a great reputation as do both of those you mention. But, if you expect very high mileage, then you may want to think diesel and those are very rare in class C motorhomes. Big block gas engines usually have a life of about 150K to possibly as much as 200K. A diesel in modern motorhomes will usually have a life for 300K or more. But the diesel is difficult to find in a class C and is much more expensive in a class A.
On the tow car, why not think in terms of a car that you can tow behind the motorhome on it's own wheels? That will do away with the extra weight of the trailer and the problem of where to store it. Also, few class C motorhomes or gas powered class A's will have the ability to deal with the tongue weight involved by could tow the car if on it's own wheels. I think that would be a much better way to go.
On learning to drive it, for a class C there isn't a lot to learn, just get used to the extra size. For towing you of course must allow for the extra length as well as the track of the towed vehicle. A class A is a bit more challenging but modern motorhomes are really not at all difficult to drive and if you take your time you can easily adjust. There are classes in driving them, but most of the classes are located in Calif. or at the RV rallies.