Sounds like you must have a draining issue. As if you didn't already know that hey. I would try snaking the drains and checking the vents on the roof for insects, nests, etc could have a blockage in your vent.
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2014 Sierra 365 SAQ
2014 F350 CC DRW lariat ultimate kodiak brown, 65 gallon titan fuel tank, bak flip box cover, many mods to come.
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