I assumed you found and checked a 30a resettable fuse/link outside the main panel. Again, not knowing your layout, and assuming all three devices are on the same circuit, I'd look for a fuse between the battery and the front jacks. It's probably easier to jump 12v directly from the battery to the jack motor. If it works, there's a fuse, probably cleverly hidden.
--2005 F350 Superduty Crewcab, 6.0, 4wd, short bed, 3.73 gears;
--2016 Montana 3711FL, 40'
--2014 Wildcat 327CK, 38' SOLD