Hey Joe, I have 2 full slides [living, bed] on my 2012 320RLDS. My underbelly is enclosed and Jayco put 2 "hatches" that are made of the same material, chloroplast I think. Unscrew the hatches and they'll be there. You'll see the nut that has to be driven to retract/extend them. A ratchet would be best as there isn't much room in there. My slides are the regular electric, not Scwintek. Look for the hatches underneath, the same way the slide moves and parallel to the supports.
2012 Eagle 320 RLDS
2012 Ford F-250 Crew Cab FX4, 6.7l PSD
3.55 E-locker, Timbrens