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08-04-2020, 12:04 AM
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#1
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New Member
Join Date: Aug 2020
Location: Los Angeles
Posts: 6
California
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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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08-04-2020, 02:24 PM
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#2
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Senior Member
Join Date: Aug 2015
Location: Mesa
Posts: 197
Arizona
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How much waste capacity do you have?
RichH
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2017 Ram 1500 Tradesman EcoDiesel
2010 Dutchmen 24 FB-SL
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Never underestimate the stupidity of people in large groups.
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08-04-2020, 04:17 PM
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#3
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Senior Member
Join Date: Dec 2011
Location: Helena, MT
Posts: 606
Montana
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Quote:
Originally Posted by aguablanco
How much waste capacity do you have?
RichH
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^^^^ 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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2012 Aspen Trail 2710BH | 470 watts of solar on the roof | 2x6V GC batteries | 1500 watt PSW inverter | Micro Air on A/C | so far strictly boondocking
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08-08-2020, 09:03 PM
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#4
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Member
Join Date: Dec 2017
Location: Kirksville
Posts: 10
Missouri
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The additional weight would probably be a concern!
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08-08-2020, 09:04 PM
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#5
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Member
Join Date: Dec 2017
Location: Kirksville
Posts: 10
Missouri
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Quote:
Originally Posted by RowRV
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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The addition weight would probably be a concern
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08-08-2020, 10:42 PM
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#6
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Member
Join Date: Aug 2012
Location: Claresholm
Posts: 13
Alberta
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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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2007 Denali 28RL-M5
2008 Ford F350 6.4 L Diesel
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08-08-2020, 11:12 PM
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#7
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Senior Member
Join Date: Nov 2012
Location: Elberta
Posts: 114
Alabama
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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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1996 F350 7.3L Turbodiesel
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2012 Komfort 3130
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08-08-2020, 11:57 PM
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#8
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Senior Member
Join Date: Jul 2014
Location: Dalzell
Posts: 714
South Carolina
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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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08-09-2020, 03:44 PM
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#9
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Senior Member
Join Date: May 2020
Location: Rochester
Posts: 51
Minnesota
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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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08-09-2020, 06:54 PM
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#10
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Senior Member
Join Date: Jun 2017
Location: Wesley Chapel
Posts: 3,075
Florida
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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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08-10-2020, 08:49 PM
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#11
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New Member
Join Date: Feb 2020
Location: Taunton
Posts: 1
Massachusetts
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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. It’s not permanent so you can take it when needed. I wouldn’t worry about the weight of 400-500lbs. Two average people weigh that much now and we haven’t killed our trailers yet. Just my two cents.
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08-11-2020, 01:41 AM
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#12
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Senior Member
Join Date: Nov 2012
Location: Elberta
Posts: 114
Alabama
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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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1996 F350 7.3L Turbodiesel
Dually w Banks Powerpack
2012 Komfort 3130
Livin the Life
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08-12-2020, 06:46 AM
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#13
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Senior Member
Join Date: Sep 2017
Location: Calabasas
Posts: 785
California
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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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2018 Voltage 3305
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08-12-2020, 06:50 AM
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#14
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Senior Member
Join Date: Sep 2017
Location: Calabasas
Posts: 785
California
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Adding additional water tank under the floor
Just saw you have a 2021 4025 so I don’t 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 weight—both 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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2018 Voltage 3305
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10-13-2020, 03:01 AM
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#15
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Senior Member
Join Date: Jun 2015
Location: Brighton
Posts: 55
Colorado
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RowRV,
I know it's not exactly an answer to you your exact question, but I use one of these with a capacity of 60 gallons. It has severed me well over the last couple of years without an issues. I will put it in the back of my truck on a tarp to make sure it doesn't get a hole in it. For us, family of 6, it allows us to get some extra showers in when we are dry camping.
https://aquaflex.net/aquatank2.html
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10-14-2020, 02:43 PM
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#16
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Member
Join Date: Oct 2019
Location: Under a Pine Tree Somewhere
Posts: 27
Oregon
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Yeah, waste water tanks becoming full and overflowing will be a concern.
These waste water tanks are designed to take the current capacity of the fresh water tank.
And if you are making the trip dump a full grey water tank, you might as well refill your fresh water tank -- or vice versa.
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