Fuel tanks in your truck and or are a totally different animal. All that stuff is regulated checked double check triple checked Etc. Seems like the RV industry can do whatever the hell they want completely unchecked.
The thickness of a fuel tank in a car is way more than a waste tank in an RV.
Overfilled RV waste tank should come out a sink toilet or shower long before it comes out of a vent through the roof
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