I would immediately be suspicious if your SUV would be rated to pull the new TT. It might be rated to pull it off the dealer's lot. But by the time you load up for full time use with 6 people, you may be adding another 2,000 pounds into the equation. Would it still be rated to pull it?
I would consider the class A but only if it is big enough to pull your SUV plus handle all the extra weight you will be also loading into it for 6 full timing folks. Big slides, or multiple slides on the Class A would also be a requirement since you are planning on being in it full time with that many bodies.