I was checking this area on my BC and realized that the plywood is also breaking on the edges and flacking. The rear panel and trim peace on the main slide was not held in the plywood it was just screwed in the fiberglass. I removed it and caulked the panel in and screwed it in with large flat RV heads #6 screws. I had to remove the front strip to install it the rear so as the screw holes did not match. I later went to the other slides and the screws are all rusting in the wood, so moisture gets in there. The Kitchen Fridge slide had only the inside screw holding and the rest was completely rotten out and screws rusted out.
I will be fixing this for good this week so as moisture will not run in, the sealing was not even sticking to the panel so moisture was going in.
I have a different setup for the slide and there are no rollers, I feel the angle at the 2 rear slides will rub hard on the teflon strips. I might resource to apply a good hard paint on the plywood to keep it from getting moiture. The ends are capable to be sealed with caulking and once dry I install the trim at a lower level even with the bottom of the plywood to protect the sealent.
I found some 2 x 2 x 1/8 white aluminum on sale at HD and feel it will be to heavy, unless I cound maybe add more flat runners on the centers to even the load. I feel the the sheet stuff would not run good on the lifting strips and might catch the carpets.
Is there a Fix for the 2009 BC's