With any hybrid you are buying used you need to look for water leak damage and delamination of the fiberglass walls. I looked at a few pictures of the 2011 Rockwood Roo 23SS and I was trying to see the hinge area on the bunk doors.
We had a 2005 Aerolite hybrid
that over 7 season I notice a little water damage on the inside hinge area by the 5" wide rubber area where the hinge attaches to the body of the trailer. On our 05' the hinge itself was like a piano hinge. We sold that one and bought a 2013 Aerolite hybrid
last year and the hinge is solid. So it is hard for water to get on thru the hinge area.
We used the 2005 about 380 nights over 7 seasons, the tenting material itself about the last year of ownership was starting to "wick
" water thru during rain storms. I cleaned them up and applied some water-proofing which helped.
In short, you need to:
~ check all the outer skin to find any bubble area, meaning the fiberglass skin in coming un-glued from it's ply-wood backer.
~ check the weather seal caulking around the outer bunk doors, especially the lower trim above the hinge.
~ get a ladder to check the rubber roof for slits or caulking missing.
~ get a flashlight and look in the back of all lower storage cabinets, especially near the front of the unit.