One other piece of information I would like to offer is, we rented a TT similar to what we wanted before we bought.
This gave us a feel for what we were getting into before we spent the big bucks. Namely 10 mpg, 60 mph, 300 mile days and being passed by everything on the road. :)
We answered a lot of questions very quickly. We also discovered that RVing and tent camping have two very differed feels.
We have towed over 25,000 miles in three years since then, so obviously we enjoy the RV lifestyle. Though we still have the tent and canoe.