Originally Posted by kevinmiles
You say that the 2009 model of your trailer had 2 gray tanks and one black. Are you sure about this? From what I have seen, black tanks are usually located directly below the toilets (presumably to ensure the 'contents' of the flush make it all the way to the tank given the small amount of water used). It is difficult to see how 2 toilets could share a black tank given this.
I basing this statement on the Northshore brochure for the 2009 model year. The 2008 model year brochure lists two 42 gallon black tanks, one 42 gallon grey tank, and the 46 gallon fresh tank. The 2009 model year brochure lists the 326QB (our model) as having one 42 gallon black tank, two 42 gallon greys, the one 46 gallon fresh. I guess the brochure could be wrong.
The previous owners did not tell me which valve was which for draining, and the owner's manual didn't say either. So I contacted Dutchmen and they email me the plumbing schematic. I might see if they can email me the plumbing schematic for the 2009 model year. That way I could see the plumbing difference.
I was just curious if anyone has ever put larger tanks in a camper. Thanks for the information everyone and keep it coming.