The common problems you seem to have addressed: A blown fuse (it was the 30amp on the tongue near the jack, correct?) or dead battery. Was the fuse you replaced, blown? Have you checked the new fuse to see if it blew, too?
Did you have the jack covered those 20months? Have you tried the jack manually? It's possible the switch is bad or the internal gears are damaged due to water and/or freezing.
That's all I can think of until I get another cup of coffee. I'm sure others will chime in shortly with more ideas.
Good luck.
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Sherm & Terry w/rescue Eydie (min Schnauzer) & Charley (std Poodle)
SOLD:2015 Jay Flight 27RLS, GY Endurance (E), Days: 102 '15, 90 '16, 80 '17, 161 '18, 365+ '20
SOLD: 2006 Ford F350 PSD, 4WD, CC, LB, SRW, Camper pkg., 375,000mi
Full timing: Some will think you're crazy, some will be envious, just enjoy the freedom!
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