Forest river seems to use that same style "H" wiper / bulb seal set up on a lot if not most of their products. I liked them at first but have learned to dislike them. The D seals I had on my previous units were a lot thicker and better quality. They were on the slide box t-moulding though. I have parts of my bulb seals that look worn or crushed like yours, and that's on a 7 month old mh. As for the waxing and silicone, pros and cons. I've tried that as mine was leaving lots of marks on the sides and tops of the slides. Making it that slick keeps the wipers from flipping very well since they ride in the same position just sliding on the slick surface. Yours may work fine though. I got issues with the slide cut out / box alignment that doesn't help matters, and FR says its pretty much unfixable. Either the slide box or hole is out of square. I'm just living with it.
John and Rebecca Dickson
Emma-7 / Little John-5 / Iva-1
Full Timing Again, Rev B
2013 Ford F-350 Lariat CC LB PSD
2015 SOB TT - With OC's Awning Poles (#8)
At least in Heaven, RVs will be perfect, and I won't have to keep fixing them.