FR used Eternabond tape on the inside of the flange on my rig. Looks to be holding up but after I used Dicor to seal under the vinyl trim I also added some around the Eternabond.
I had pulled the vinyl trim and caulked up about a foot and reinstalled the trim while the caulk was wet. I have used WoodRot epoxy to fill in where the missing wood was and also used a liquid that hardens the wood. There was water damage and soft wood where one of the rollers contact. I have used the liquid there also. I have cut the carpeting out and will also epoxy a 3/8" piece of plywood over the existing plywood.
2013 Crusader 330 MKS
2013 Chevrolet Silverado LT 2500 D/A