I don't have answers for most of your questions, but would advise caution on purchasing a TT from a dealer that is pretty far from where you live. We bought a new TT at a home show in our town, but the dealership was 100 miles away. We had warranty work that was needed, and had to haul it down (100 mi.) leave it for a week...but we still had to drive back home that day (100 mi.). Then another 200 miles (there and back) the next week. 400 miles, 2 wasted days, lots of $ in gas. After a couple of weeks, we discovered the warranty work was done incorrectly. I decided to correct the errors myself, rather than hauling it all the way back and incurring even more costs.
So, even if a distant dealer may give you the best price, look carefully at dealers that are within easy driving distance as well as having a good reputation for service and repairs.