Bill, I have a 3124KB and that ADCO cover seems to be to small for me, I have about 5 and 1/2 feet from the top of the AC unit to the bottom of the box not counting the wheels and the HI-LO cover seens to be about right, my length is 20 and 1/2 feet (not counting the propane bottles or the battery) and my width is 7 and 1/2 feet. All this was used to figure proper size using your method. Am I doing this right? I mean you wouldn't think the difference between a 2720 and a 3124 would be that much.
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