Why bunk house ? Ones with 4 bunks are hard to find and likely will be >24' !
As for your tow vehicle, there are some "upgrades" I recommend (these would probably come with the factory tow package anyway). Auxiliary transmission cooler, HD radiator and most important, a higher gear ratio, >3.7
I will also repeat what I tell every first time TT buyer. Buy used, 2-5 years old. It will have depreciated a lot, and you can see if you like the floor plan. After a couple of years, then buy your first new TT !
