I did a wiper seal replacement on the side of my slide on my previous trailer. The seal on my Coachman was an "H" shaped wiper seal that went over the wall edge. The exterior had a "D" bulb seal that slid onto a groove. The interior wiper "H" seal had an adhesive strip and was stapled to the interior wall.
Can you post a pic of the area that needs repaired. Did you find the exact replacement seal yet?
2011 Coachman Freedom Express 295RLDS- Sold
2015 F-250 FX4 SUPER DUTY 6.2L Gas 4WD SuperCab XL 3.73 rear / 158" WB / 8' bed. Factory anti-sway and brake controller