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Jim, after leveling the trailer side to side (I use short boards as several have mentioned above), just drop the landing gear to the nearest "notch". That will keep the trailer level side to side--one leg may be extended longer than the other but the effect will be to level the trailer. That's all there is to it--no counting, no adjusting, no shims (though I do use short boards in gravel, grass, or dirt as base for the pads.)
After disconnect the legs may be raised or lowered to level the trailer front to back. The side to side level will not be affected by this final adjustment.
That's my practice over 15 years, three fifth wheels, and too many different site conditions to enumerate.
And that's my opinion; others are free to differ in theory or in practice.
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