We have a 2013 x213. We know when the slide out is fully extended when it is moves into a slight upward direction (leveling) and we hear several clicks. We also notice the dinette seat closest to the bed is tighter (less seating space) than the other seat, so I remove the back cushion altogether for that seat and use the bed matress as the back cushion.
Jim & Sue
2013 JayFeather Ultra Lite X213
2011 Tahoe LTZ 4wd with HD towing package, GM trailer brake control
Honda 2000i generator
Equl-i-zer sway control and WD hitch:)