J & C,
I parked on a level road (actually used my driveway). I used a large 4 foot carpenter's level in the center of the coach placed on the floor with the slide in (running from front to rear). Select manual level (jacks) and raise the front of the coach till it is perfectly level- as read on the level which is on the floor. (Always level front to back first - manufacturer suggestion).
Then I turn the floor carpenter's level so it is going from side to side (left to right). Again use the manual level feature to level the coach so the ball is a little to the left (coach is off level to the right).
All depending on how long/heavy your slide is will determine how much off level (left to right) you will need. Then I calibrate the system at that point. The computer will now go to that same spot with the auto level function. When you slide out the driver's side slide, the weight will pull the coach to the left and compensate the "calibrated level" and bring it back to true level - and the door does not stick!
I was extremely lucky as I only needed to do this once, but you may have to experiment to find the sweet spot - depending on how heavy your slide is and how much it moves the coach. Mine has been golden ever since, and we have been out a lot since on all types of sites!
(The level pic is just for illustration purposed of course and yours will be different.)
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