I use a 2 foot level the same as others. I use the countertop by the door, works well. As Javi said, doesn't need to be perfect and like him we have always set ours up with the front high so runoff goes rear. The end of last year I found if I go even higher in the front we get less streaking on the sides.
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2007 Silverado 2500HD 4X4
2013 Springdale 303BHSSR
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