I opened my slide in mid winter and it tore the heck out of the rubber seal. I spray them down with silicone spray all the time. Made no difference. Now, I won't open it without being certain that it's not frozen or stuck.
2015 Forest River Vibe 268RKS being pulled by a 2010 F150 Lariat 5.4l, 3.73 axle Super Cab, Max Tow with 11,300 lb tow capacity , Equalizer 4 point W/D hitch