I use two outside mounted levels to get parked.
I then confirm with a level app on my smartphone on a few outside places (tongue, window frames, etc.) However the final say for level is the center of the floor, and the counter around the sink. Experience has told me that a level counter means splashed water is less likely to drip onto the floor, and a level sink means proper draining.
Then, like others, I often adjust a tad to ensure water runs off the "far" corner of the trailer!
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2012 FF 214WSD and Equalizer WDH
2019 GMC Sierra SLT, Crew Cab, 4x4
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