Slide blows fuze

In the breaker/fuse panel, there are two 30amp fuses, but apparently one is not being used. At least, when I removed it nothing stopped working. Initially I used the fuse in that spare position to replace the blown fuse. I have since invested in a bunch of fuses. Now let me see if I get this straight. The hot wire goes from the positive pole of the battery, thru the fuse in the panel and then directly to the slide motor. At that point two ground wires go from the motor and to the slide switch to make a contact with a ground point. All the rocker switch does is rocker between the ground point for extending and retracting the slide? That means that the hot wire going directly to the slide motor is grounding out somehow, blowing the fuse. Why it doesn't blow while stationary is kinda a mystery. But there are some really rough roads between Southern California and Southwest Washington. I had called the RV dealership and talked with their tech. It was a mystery to him also, but did mention something about a Nut Cover and a lock bolt that controls travel of the slide maybe being not correctly set allowing the motor to bind when retracting, causing an overload. Maybe, but I can't recreate the short when parked, even with multiple extractions and retractions. Sounds like I should check the wiring around the motor and see if anything could be grounding it on the hot side. If it was grounding on the ground side it should be running all the time, which would blow the fuse when at the end of travel and extend the slide mysteriously if on the extend ground side. I sure would like to see a schematic.