I think you might not have gotten an answer because your question is vague.
What specifically do you mean by the Slide Out removing the window gasket?????
Could you provide more details, or a picture if necessary?
2013 Rockwood 8289WS
Mods: Central Vac, PI EMS-HW50C, 2025RV, (2) SCS225 Trojans, PD9260, Awning Remotes & LED Lights, Eliminators, External Water Filter,, Intellijacks
2008 RAM 3500 Cab&Chassis Hauler Bed, B&W Companion Hitch
All My Modifications are at this link: