Should be a 30 amp blade type removable fuse located on a wire from the battery to the tongue jack. Thin black wire I think.....
Do you have the manual crank for it. If it is getting power and still isn't moving it could just be jammed.
2014 Jayco Swift 281BHS
2015 F250 XLT 4x4 Crew Cab, Short box, 6.2 gas
Solar powered! The trailer not the truck!