We had the Level-Up system retro-fitted to our 2010 Montana and it made it rock solid, but it was the samll Montana, 2955RL only 34 feet. Now the Redwood 36RL being 40 feet is still pretty solid, maybe not quite as solid as the Montana, but then again it has a lot more over hang behind the rear jacks, I think they should have been placed a little further back behind the axles and would have made it a little more stable.
But yes, it does make a big difference as to the footing for the jacks. When on a good cement pad it's very solid, but if on soft ground not so solid. If your unit will not hold level in memory it sounds like you've got a bad sensor box or it's not attached solid and is moving everytime you level or travel.
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