My '13 has the more hidden d-seal. Forester and sunseeker identical in that aspect, at least what I saw at the factory a few months back. I can assure you, either way its done its sealed. Brian may can shed more light on it. That trim piece coming loose on yours can be bought at most any RV place or at camping world. Can't remember proper name for it. Over time, they can draw up a little. Same trim cover you see on tons of towables. I'd just pull it out and replace with new. Very cheap for a whole role.
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.