I use the Q2200 and the 6' hose. I have a separate 20lbs tank that I move with the grill, allowing me to put it anywhere I want.
You may know this, but if you come off the low pressure hose on the coach, you need to remove the pressure regulator on the Weber and add a new fitting. I decided not to go into my TT plumbing for the flexibility.
I like the grill very much, and the collapsible rolling cart. Although, I wish the cart were more stable. If it were, I'd wish the setup was lighter...can't win.