Do all of the above. I prefer to use as a minimum a 36" level to manually level and then recalibrate the system. Have only had to do mine in almost 5 years.
If you do this you shouldn't have to manually adjust any more after auto level and the unit will then return to hitch level as you want.
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2018.5 Montana 3791RD
Full Timers 9/1/2010 through 1/16/2020.
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