My vote is for a class A and here is why.
1. I like the option of not having to stop when my DW has to use the restroom.
2. Unless you have an unlimited supply of money, you will find yourself staying parked for extended period of time. That means you will have to take your big truck out for a gallon of milk or use it for your day to day running around. With a Class A you can tow a small vehicle for the day to day running around while not racking up miles and wear and tear on the engine you are going to depend on to take you around this great nation.
3. Since you will be fulltiming and not just out on a week long camping trip you will want to carry more with you. A class A will offer you more storage space.
4. There are tow dollies that offer room for your motorcycles as well as your car.