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Old 06-27-2012, 12:07 AM   #1
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Has anyone noticed or reinforced their underbelly fresh water tank?

My tank, when filled, sags leaving probably more than a few gallons of water unusablebecausethe pump intake is higher than the water.

The tank seems sturdy however it is held in, just the bottom of if sags down.

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Old 06-27-2012, 12:56 AM   #2
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Some have replaced the plywood with heavier/thicker plywood. There was stories a few years back about that problem. Tanks falling out,etc.
I reinforced the braces under mine and added one more.



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Old 06-27-2012, 02:12 AM   #3
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Like Farmer, I replaced the thin plywood with a new, thicker sheet and added new supports under the tank instead of the thin existing ones. I am surprised this issue has cropped up again.



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Old 06-27-2012, 02:13 AM   #4
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Where is the plywood you guys are talking about? It appears mine is held by the edges on the framecross member.
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Old 06-27-2012, 03:06 AM   #5
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The plywood is right under the tank.
Do you have the membrane covering the bottom of your trailer, or is the tank out in the open where you can see it?




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Old 06-27-2012, 05:30 AM   #6
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There is a thick plastic membrane.
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Old 06-27-2012, 07:02 AM   #7
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If you want to investigate, you can either try feeling the bottom of the tank thru the membrane, or try tapping on it. Maybe you will be able to determine if there is plywood under the tank that way. If that doesn't work, you will have to drop a corner of the membrane so you can see in there. If there is a thin piece of plywood there and you want to replace it with a thicker one you will then have to drop the membrane. If there is plywood there now and it's not water soaked and rotten, I would opt for another support running crossways of the trailer under the middle of the tank.





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Old 06-27-2012, 07:23 AM   #8
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A support under the middle of the tank would probably work. I really don't think there is plywood under it as I have tapping on it and it clearly felt and sounded like a plastic tank.

I'll have to peak in there and see what's going on.

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Old 06-27-2012, 07:45 AM   #9
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I had this problem also several years ago. Whe the tank was full it had a noticable sag, even with the membrane. I dropped the black membrane that covered the underside of the trailer just enough to expose the water tank.Plywood was notinstalled under the tank from the factory back then, the tank set between 2 cross members on a small ledge. And what made is worse the front crossmember was not installed straight up and down, the bottom side with the ledgethat the tank set on was futher forward than the top of the crossmember.The water tank was setting on about a1/4" ofledge. I bought a piece of 1" marine grade plywood and cut it the same size as the water tank. I inserted the plywood under the tank and between the crossmembers, after I corrected the crooked crossmember.No more problems!!!
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Old 06-27-2012, 09:09 AM   #10
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Daystrom - I bet your trailer has the enclosed underbelly...

Ours does not - there is NO PLYWOOD. I can see my freshwater tank...it is strapped in with the frame xmember holding it up. I have never filled it - will do so this weekend just to see if it sags. Maybe you can lift tank just enough to slide plywood or boards under it to support it.
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