Congrats on your purchase and you did well purchasing from Sherman. We got our Phaeton from them back in September. While I realize you are off to the West Coast, I would never hesitate to take my coach to Sherman for service.
For those of you out there that haven't dealt with Tiffin before, it is very easy to get an actual price sheet with real prices on it from either Tiffin or 3rd parties - hard for a dealer to cheat if you do the least amount of research. Tiffin is very liberal with their warranty repair process - the owner can take it almost anywhere to be repaired and Tiffin will reimburse the expense - it doesn't have to be a Tiffin dealer or Tiffin Service center either.