Just finished installing a new 30 gal tank inside the trailer under the jackknife sofa. We never have used the area under the sofa for anything due to it being somewhat hard to access. Have to pull the sofa halfway out and then lift the lower valance to get anything in or out. The wife had nothing but trouble with doing that!!
Decided on that location since putting another tank forward of the main tank would be too far forward and add too much tongue weight IMO, and behind the main tank is the slide mechanism. So,--- inside worked out very well.
Also considered replacing the main tank with a larger one. But prices are nothing short of ridiculous for most new tanks. This one was only around $75 including freight from EPrey. Originally I had aboot 32 gals of fresh capacity, now have aboot 58 to 60 at max fill.
Since we have 32.5 gals in each of the holding tanks, should be just fine!!
Both tanks fill from the same intake, main tank will fill first (or faster), and can shut off the lower vents (overflow) when full and only use main tank for shorter trips. Both tanks are vented to the high point. The aux tank feeds the fill pipe of the main tank and the pump only draws off the orig spot under the trailer.
Probably have added some tongue weight when using both tanks, but since the aux is almost directly above the main tank, not nearly as much as if it was forward of it. Gonna have to do a weight check here soon.
We originally had a 30 gallon tank installed under the sofa.
I removed that tank and bought 3 40 gallon tanks on e-bay. The tanks are hung below the RV between the main I-beams for the trailer. One tank is tied to the original fill/vent. I added a second fill/vent for the other two tanks, the fill lines, the vent lines, and the pump draw lines are each T'd together to essentially create an 80 gallon tank. The pump draw lines are each valved (one to the single 40 gal tank and one for the 80 gal tank)so I can select which tank to draw from. I had previously removed the 40 gallon grey tank and installed 3 35 gallon grey tanks. We can now stay over a week anywhere without problem.
My GVWR is such that I could drive with the tanks full, although I normally only fill the 40 on the road (if needed).
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