Hi Capt Skup,
My dad's Weekend Warrior toy hauler has that door. I personally haven't had one in a Sunline though. When we took delivery on the WW, they specifically told us to be careful when closing the door and to not let it go, as the material could rip if is closes fast. I haven't taken a shower in there, so I can't tell you from experience how it works. It seems to open and close pretty easy, but I don't know about the squeege part.
P.S. Did you pick up your '08 SD PSD yet?
2007 T-286SR Cherry/Granola, #6236, original owner, current mileage: 7376.8 (as of 7/24/15)
2008 T-286SR SE, #5001
2005 Ford Excursion V10 soon converted to 7.3 PSD
Past Sunlines: '97 T-2653, '94 T-2251, '86 T-1550, '94 T-2363, '98 T-270SR