The flat roof is a none issue.
You will find that it is very very rare that you can get the coach absolutely perfectly level. So the water is going to run off the low side 99.9% of the time. And even if you are perfectly level it only takes a small amount before it is going to run off the front.
Plus a flat roof is real nice to walk on when you need to get up there.
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2012 Showhauler 28'6" Motorhome on a Columbia w/ 450 Mercedes.
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