Drove a couple + hours to a dealer that had a 4200, 4100 and Road Warrior 425, all 2015 models. Another forum member and one dealer told me the rear bath extends 24" into the garage. I measured 32",so it will be close. Noticed that if the 3 season door is slid open, I gain 6" in the center fore to aft. Thinking I could drill a couple of holes and use locking pins like on the rear bunks to hold the doors in the open position. Now how to keep then from pivoting. Still going to try the bike inside before closing the sale. If I load the RT the whole way against the driver side it fits, but I like loads centered in back.
The RW is nice too, now has the big bedroom window and hidden BR TV like the 4200.