Are you asking about retracting the rear bed slide manually? If so, yes there is a way. If you lift up the flap in front of the bed, about in the centre, there is a place to insert a metal crank and you can turn and retract.
I'm having a brain blip right now and I can't remember if it's the same crank you use for the stabilizers or a different one. I'm leaning towards it being a different one.
2015 Jayco X213
2014 Ford F-150 Platinum EcoBoost w/ MaxTow