The tanks are designed to fit the space available - a more or less exact fit. It’s not something that’s upgradable by a user. Not only that but the tanks are also sized by weight to keep the trailer, the axles, the trailer tongue weight all in line.
If you absolutely need bigger tanks, you need a different TT that is designed with larger tanks.
Keep in mind, larger tanks usually mean a bigger TT which can mean a bigger tow vehicle.
Everything is connected.
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2017 Winnebago Adventurer 37F
2016 Lincoln MKX Toad
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