This will help keep the wheels on the ground.
Check this thread.
http://www.thorforums.com/forums/f8/...tion-6400.html
When you do the manual level only lower the rear jacks till the rear just barely moves, then start the zero point calibration.
On our F53 and now the E450 I always build a ramp by putting 1 block in front of each front tire then stack 2 more in front of those. Drive on them then auto level.
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