I find stick on levels tend to shift, possibly due to heat affecting the stick-um. I like to double check mine regularly.
Phone app levels are handy but you have to be sure to calibrate them, especially if you have a phone cover
I'm rather paranoid about my refrigerator so I use stick ons, phone app AND a stick level, plus a big left/right level on the pin box.
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2015 Crossroads Cruiser Aire CAF27RL, 2018 F250 diesel crewcab SRW 4WD short bed, Trailer Saver hitch with Reese adapter on Ford OEM underbed 5th wheel connector.
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