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Old 09-19-2020, 11:42 PM   #1
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Added a 2nd water tank

After installing a new axle I gained 2" more inches of space above the axle. Perfect spot for a 2nd fresh water tank. There are hundreds of tank available, but most are weeks out. I lucked out and found a perfect fit with this in stock 39 gallon tank.

The main location where the extra tank will benefit us, is at our hunting property in upper Michigan. I don't mind running a little excess grey water into the woods, or a shallow hole in the ground.

Since the new axle increased my weight capacity by 900lbs, I've easily got enough to carry the extra weight and it will be carried directly by the frame reinforcement I built for the new axle. The camper frame or body won't see the extra weight at all.

It was actually a tighter fit than I thought, but I got it to go. It would have been easier if I had planned a tank with the axle upgrade, but I got lucky and didn't have to drop the axle to get the tank in.

I welded up some angle iron brackets to support the tank and installed blocking (to the floor) on the sides to keep it from moving around.
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Old 09-19-2020, 11:44 PM   #2
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The fill hose comes up the through the floor and I'll box it out to hide it. A small aesthetic price to pay to more than double the fresh water capacity.

I added a tank heater (not shown) since all my other tanks have them, and the camper has an enclosed underbelly. I swapped out the 3 gang switch plate for 2, 2 gang plates and made labels for them.

I also ran the wires for the fill sensor, up into the bathroom wall, and will finish the connections with a new 2nd monitor when it arrives.

I tied the new water line into the existing water line from the first tank, using a bypass valve. It acts basically like a selector valve, so I can easily switch from one tank to the other.
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Old 09-21-2020, 07:15 AM   #3
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Quick update...I had an issue which I had wondered about before I started. The 3 way valve (pic with the single valve) I used to switch between tanks caused too much restriction and the pump just cavitated and sputtered water out. So pulled the valve out and swithed to PEX in that area and used less restrictive ball valves and fittings. I even switched out the winterization valve. Bottom valve is the 30 gallon tank, middle valve is the 40 gallon tank and the top valve is for winterization. Works great now and the pressure might be even better that it was originally.
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Old 09-21-2020, 10:12 AM   #4
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Nicely done. The standard 30 gal. fresh water is woefully inadequate, the only plus is it makes it hard to overflow the gray tank, lol.
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