If it was plumbed correctly, yes. It could have anywhere from one to three vent/overflow hoses depending on size and configuration.
My trailer had 2 because I actually had 2 tanks. edit: actually, technically it had 3 because the one by the fresh water gravity fill was actually connected.
My Greyhawk has 3 all plumbed into the one tank.
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-2018 Greyhawk 29MV
-2020 Jeep Wrangler Unlimited (JLU) (Primary Toad)
-1994 Jeep Wrangler YJ (Secondary Toad)
-2014 Jay Flight 28BHBE & Ram 2500 6.4L CC 4x4 (sold)
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