Adding additional water tank under the floor - Dutchmen Owners

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Old 08-04-2020, 12:04 AM   #1
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Adding additional water tank under the floor

Hi

Does anyone know, or has anyone added an additional water tank and mounted it under the floor and to the frame? I have 9 people in our RV almost all the time when we travel and I need the extra water.
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Old 08-04-2020, 02:24 PM   #2
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How much waste capacity do you have?
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Old 08-04-2020, 04:17 PM   #3
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How much waste capacity do you have?
RichH
^^^^ This. Without knowing how your group uses water I can't say for sure what will happen. For my family, we drink some and sweat/pee it back out outside and also lose some water to steam from boiling it. Also occasional outside sprayer usage. But then all the rest of the water in the fresh tank will eventually end up in the black and gray tanks. So you need enough capacity in the waste tanks to accommodate all of the fresh or else it starts backing up out of floor drains or toilets.
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Old 08-08-2020, 09:03 PM   #4
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The additional weight would probably be a concern!
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Old 08-08-2020, 09:04 PM   #5
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Originally Posted by RowRV View Post
Hi

Does anyone know, or has anyone added an additional water tank and mounted it under the floor and to the frame? I have 9 people in our RV almost all the time when we travel and I need the extra water.
The addition weight would probably be a concern
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Old 08-08-2020, 10:42 PM   #6
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Possible

Additional tanks are available in all shapes and sizes, but there are a few concerns. As already mentioned, weight is a very serious consideration, and you will need to find the space to mount the tank.
Check out all tanks available on this website: https://www.plastic-mart.com/category/33/rv-water-tanks
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Old 08-08-2020, 11:12 PM   #7
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At 8.34lbs per gallon, fifty gallon tank would be 417 pounds in addition to your original tank weight. You might not have room to begin with.
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Old 08-08-2020, 11:57 PM   #8
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Assuming you're towing that with some kind of truck, I'd suggest you look for some potable water tanks you could keep in the truck. A 12V RV water pump and some hose would keep you from having to lug from one to the other; just connect the hose, and turn on the pump.
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Old 08-09-2020, 03:44 PM   #9
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I concur with the weight issue raised. Water is heavy and adding an additional 300 - 400 lbs. to the bottom of a trailer could result in overloading, balance issues, and overall unhappiness. I get the capacity issue, as we typically camp in state parks or municipal campgrounds with no water hook ups. The back of the pickup idea has merit.
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Old 08-09-2020, 06:54 PM   #10
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this just came out today... maybe it will help a bit.

https://rvlife.com/grey-water-hacks/
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Old 08-10-2020, 08:49 PM   #11
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Why not look into a water bladder? You can put it in your pickup bed or under your bed in the trailer when you need it. Itís not permanent so you can take it when needed. I wouldnít worry about the weight of 400-500lbs. Two average people weigh that much now and we havenít killed our trailers yet. Just my two cents.
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Old 08-11-2020, 01:41 AM   #12
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Your two average people do not travel down the road in your trailer. At least I hope not.
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Old 08-12-2020, 06:46 AM   #13
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I say learn how to take faster showers. That is the main culprit. Also, if you are boon-docking I would go longer between showers too.

Adding a tank will be a massive undertaking. Securing it, dealing with the added weight (both in increased weight on the trailer and potentially exceeding your trailer cargo limit plus balancing the load) and then pumping the water out will all be a challenge. You will also likely run out of gray tank capacity as well.

Personally, I would consider upgrading a trailer to a model with greater water and holding tank capacity before I took that on. My Voltage holds 100 gallons of fresh but only 80 gray and 40 black in the holding tanks so I could only add 20 gallons and that would require perfectly balanced use between kitchen and bath gray plus the toilet.

Anyway, good luck.
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Old 08-12-2020, 06:50 AM   #14
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Adding additional water tank under the floor

Just saw you have a 2021 4025 so I donít think upgrading will be an option and you probably already have 150 gallons of fresh on board so you are in a tough spot here.

So unless you are towing with a 1 ton dually that extra weightóboth fresh water and holding tank need will also likely bump up against your trucks max payload too.

Let us know what you decide.
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