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I wouldn't worry about the black tank in that situation. The sloshing around while you drive will help loosen solids anyway. The gray is more of a personal preference. Dumping grays after 1 night is hardly worth the time to me. unless you take one heck of a shower the weight will be minor.
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2016 Montana 3160RL w/MOR/Ryde IS and Disc Brakes
855W Solar System, TriStar MPPT-60 Controller, Magnum 2800W Inverter, 6 Trojan T-105REs
2015 Chevy Duramax SRW SB Crew Cab
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