Your Montana 3810MS trailer has one (1) 49-gallon black tank. What galon capacity is your portable tote? If it has relativley low capacity are you able to adequately flush the tank? Could consider a 36 gallon one. In my case, I pre-fill the black tank with 15 gallons of water through the black tank flush connection, measured with an in-line turbine meter, and when I dump I use plenty of flush water and fill and dump several times to ensure all the contents are flushed out.
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