The two drains together should be your hot and cold water low point drains, used when winterizing. The single lone drain should be the fresh water tank. I typically keep about 10 gallons in mine for flushing the toilet when traveling or giving our dogs a drink. Draining at the campsite may create a mud bog if you have a lot in the tank.
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Marshall
2012 Laredo 303 TG
2010 F250 LT Super Cab, long bed, 4X4, 6.4 Turbo Diesel
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