I just was reading my owners manual and was going to ask a question about lubing the slides when I found this thread. The manual didn't mention the seals. Wonder why not. It did have this caution.
"This system contains a pre-lubed bearing that is lubricated when the room is
moved in and out. Do not spray oil or grease on the rails while the room is extended."
'11 Eagle 320RLDS
'02 F350 PSD Dually 4WD
DW's Ride, '13 Expedition