No idea about adding tanks. Adding tanks would also add considerable weight when full, which could be a concern, although that unit should have a pretty good OCCC. For reference, water weighs 8.34 lbs per gallon.
With conservation, careful use of water for washing and rinsing dishes, and most especially without showers (use CG facilities, go swimming, Navy shower, etc.), 40g can last quite a while. My last unit only had a 32g tank and my family of 5 could go for 4-5 days.
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2021 Thor Four Winds 26B on Chevy 4500
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