To take what NED said one step further
Let us assume you put in a slide out stablizer, Basically a jack that goes between your extended slide out and the ground.
Heaven forbid the motor home "Settle" due to a jack being on soft ground, or blow a hydraulic line, or you retract the jacks w/o retracting the slide............... OUCH as the slide out is torqued the way it's not designed to torque.