The system is designed to eliminate the possiblity of frame stress, thus you can not operate jacks individually. The pressure wil equalize between the sets to put equal pressure on the frame. There are times that manually operating the system might be the better choice and it sounds like you were in that situation. I would have used the front landing legs to level front to back, then right or left to level right to left and finally put the opposite side jacks down just enough to touch the ground. Only only problem with that type of leveling with jacks just touching the ground, you might get a little more bounce than normal. It really is a great system, I was in the shop when they retrofitted our Montana and had an opportunity to talk to the Designer of the system while the work was being done.
Michelle & Ann
2018 Chevy 3500HD Crew Cab High Country DRW, D/A, 2016 RW39MB, Dual ACs, Auto Level, Auto Sat Dish, Stack W/D, King Sleep #, 17.5" Sailuns w/Disc, MORryde IS & Pin, Comfort Ride Hitch, 5.5 Onan, Res Fridge & Induction Cook Top