Sorry for leaving this info out... and I KNOW better!
2005 Gulf Stream Independence, class A, 36' gasser, model #8361.
Last year at Lazydays FL a technician briefly looked at the jacks and said they were so messed up he couldn't tell anything about them. Well, THAT was a useful statement, right? By then I was so sick of waiting for them to get things done I told him not to bother looking at them but to finish what he was doing and let me get out of there (it had taken more than a week to get minor warranty work done + 3 days spent in their campground waiting for parts).
He implied that the damage to the rear jack was what was causing the front jack to misbehave. I don't have a clue.