We bought an '02 Georgetown in 2010 from its original owners. It had been very well looked after except for one detail I missed. They hadn't used it for a full season before they decided to sell and it had been parked with the living room slide extended the whole time so the topper was also extended and was facing south.
First trip with us, we were at an SP near Bellingham WA, with the slides out, when a rainstorm hit. The overhead cabinets in the slide filled with water! Luckily there was a full pack of table napkins in there that caught most of the deluge.
When we got home, I unrolled the topper to find that there was no vinyl left, just the netting!. The awning's long sun exposure had wiped out the vinyl skin. Unfortunately, the cabinets had to be replaced due to mold build up.
I did the job myself over a few weeks (advantage for a retiree!) and they looked good. I was disappointed in the poor workmanship I found with the cabinets removed. There were long wiring runs with no support, very crudely finished woodwork that was not visible with the cabinets installed and very flimsy attachments holding the cabinets in place. Despite there being two square steel tubes running the full length of the slide-out to form the ceiling structure, the cabinets were attached to the ceiling's Styrofoam insulation with sheet metal screws. I was surprised that the empty weight of the cabinets hadn't pulled them loose.
My rebuild attached the cabinets to the steel tubes!