Well, if you are SURE the fuses you checked are the correct ones and you have checked for 12 VDC power at the jack screw switch; it could be a bad winding on the motor I suppose.
In my camper, behind the gas bottle at the top, is a black piece of tape. Under that tape is a hole. That hole gives access to the stub shaft on the power transfer shaft that connects the two jack screws.
Put your manual Landing Gear/slide hand crank through the hole and onto the stub shaft and rotate the shaft slightly and see if the motor will now run. If it does, it is new motor time when you get home.
If it does not, then keep cranking as that crank will be your new friend until you can... get a new motor.
Lou and Laura with Bella - German Short Hair Pointer
2008 GMC Sierra 2500HD Crewcab SB Allison Duramax
2010 Flagstaff 8526RLWS - Superglide 3300
HAM CALLSIGN - KC3FFW