I have learned with my Lippert 6 point level-up to get the trailer as near level manually as possible before using the auto level system. That means I still use a carpenter's square for front to back and I have a bubble level attached to my trailer hitch king pin for side to side. I also put blocks under the jacks themselves, as high as they need to go, depending on the slope of the campsite in order to keep them from going out of stroke from over-extending. After about the 3rd time of it stroking-out and getting error codes and having to finish setting up by using a carpenter's square anyway, because I could not get rid of the error, I learned the trick, and I've never had a problem again.
So, just like with all my prior travel trailers that were set up with boards under the tires, and using the carpenter's square to find level, I still do the same with the 5er. I do have the assurance though, that, if it's not perfectly level, when I hit the auto level, it will be, and not have to fret over an out-of-stroke error again.
My 5er is not very forgiving here. But I've learned what it takes by trail and error and now have no problems setting up anywhere. I know the maximum length each jack leg can extend now, and I make sure I've built up blocks to at least that height. Side-to-side, I still put boards under the low side tires. It works for me.
This was one such campsite last Summer where I lost the stroke on the rear and couldn't get it reset. I manually got it as close to level as I could. This one one of those learning curves:
Here's another time it happened last Summer:
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2019 Montana High Country 375FL
2014 Chevy Silverado Duramax, 6.6L Dually