I just use the iPhone app that comes with the phone. I take it out of the case and place it on the floor. I did finally tape on of those bubble levels on the front panel on my 5th wheel, and no, they DONT freeze in the north. My previous trailer I had leveled with the phone then attached the bubble levels, but needed two people to level it. On my 5th it has auto level, so I only need the one level that I stuck on the drivers side so I can check side to side before unhooking.
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