Something is obviously wrong if it's making that much noise... With the room out, step back 50 feet or so and observe how "level" the room is along the top and sides in relation to the opening. Make the same observations with the room 1/2 in and fully closed. Does it look fairly level? As it's opening or closing does the room wobble or cock quite a bit from side to side?
It is possible that room is just out of adjustment or something more serious has happened such as a roller in the guides has broken or come loose.
94-Newmar Kountry Star 40-KSDP
Spartan/Cummins 8.3C-300HP/Allison 3060 WTEC-II/25yr RV Tech RVIA Certified/Onan-Cummins Certified