Electric to Power Tongue Jack

Got to the camp. Leveled side to side, unhooked everything and went to level front to back. Jack would not work. OH OH.

Plugged truck back in to camper ..... Jack worked fine. Also tried it later with shore power and it worked fine. Thought maybe battery low ... but after three days of shore power ... still won't work without shore or truck connection.

Any ideas on what's happening here? Does not make any sense to me!!!