For that length of time you can get one of those "blue tote tanks" to bleed off gray water if need be. Black tanks should hold up if they are for sure empty and you do "navy poops". I carry a 20 gallon on long dry trips JIC. Nothing worse than standing in 2 inches of shower water with a head full of shampoo (assuming you have hair). There are several manufacturers...just make sure you don't fill it up before shutting off the RV valve.
https://www.walmart.com/browse/rv-po...aWQ6ODUzMQieie
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Now an SOB
Traded Thor for Melbourne Prestige 24NP
2018 THOR Chateau 35SF
Two Labs, Bugsie & Blondie
Blondie passed in 2020 at 5 to Leukemia
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