I have found once you level the unit side to side via leveling blocks and drop the landing gear the unit will be within an acceptable level range, however, putting the slides out and adding all that extra cantilevered weight on the 3 slide side causes that side to drop some on the landing gear. I compensate for that when using the leveling blocks. Otherwise I'll purposely have it a bit unlevel toward the door side and when the slides go out it corrects. If you consider the weight of those 3 slides, the length of the frame and the fact that the big slide is right over the suspension I think there has got to be some flex in the frame and movement in the suspension when the slides go out. Anyone have any input on that?
If yours is way out of level after being sufficiently level side to side before the landing gear goes down maybe there is a problem with the hydraulics. I have marked the landing leg with a sharpie and know it goes down a little when the slides go out but you say that side is your high side, correct?
2013 Sandpiper 365SAQ
2008 Ford F350 Super Duty
6.4L Powerstroke Long Bed CC