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Old 02-25-2018, 02:03 PM   #1
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FE Water tank delima

I'm working on finding a place for my water tanks. Planning on having a 100+ gallon fresh in the back under the bed (inside so it wont freeze). But I'm having a hard time finding a place to the grey.

Option #1: Mount underneath behind the rear axel and gas tank.

Option #2: Mount in underbelly storage on one side of the bus.

Option #3: I found some space today while looking under the bus. I think there is room for a ~40 gallon tank underneath in the middle of the bus on top of the driveshaft.

Wondering if anyone has done this. Option #3 is the best location as it is closest to the shower and sink drains.

The drive shaft does not look like it has any up/down leaway at this point. That connection is a little further back towards the differential.

Thanks for the advise!
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Old 02-25-2018, 02:27 PM   #2
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Put your gray tank closest to the drains as you can, the less plumbing the better.
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Old 02-25-2018, 02:30 PM   #3
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For sure. And that would be located in the center of the bus between the frames on between the floor and the driveshaft.

Is this a safe place of the tank?
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Old 02-25-2018, 04:52 PM   #4
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Most people try to mount the grey tank close to the fresh water tank so the shift in weight is minimal as you use up your fresh water supply.
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Old 02-25-2018, 08:43 PM   #5
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Most people try to mount the grey tank close to the fresh water tank so the shift in weight is minimal as you use up your fresh water supply.
That would be Option #1. But the problem with that is my gray would be really far away from my shower and sink drains. Not worried about the distance with clean water because of the pump.
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Old 02-25-2018, 08:56 PM   #6
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Put the fresh water tank where it's convenient, and put the grey water tank close to the drains.

In a 20000 lb vehicle, a couple of hundred pounds here and there will make no difference. Bear in mind weight distribution, but don't let it rule your layout.
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Old 02-25-2018, 09:00 PM   #7
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Have you heard of anyone putting their tank between their floor and driveshaft? Thats the best placement if its a safe place.
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Old 02-25-2018, 09:05 PM   #8
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Have you heard of anyone putting their tank between their floor and driveshaft? Thats the best placement if its a safe place.
The driveshaft doesn't move up and down much, so if there is room ...

You need to allow room for the plumbing required to drain the tank too. That needs to go on the driver's side.
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Old 02-25-2018, 09:12 PM   #9
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Thats what I want to hear! Yea. Should be plenty of room to the side of the driveshaft to run plumbing. Planning to shoot it out on the drivers side between underbelly storage and rear wheel. Just have to make sure its far enough from the exhaust not to melt. Should be enough space though.
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Old 02-25-2018, 09:16 PM   #10
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Thats what I want to hear! Yea. Should be plenty of room to the side of the driveshaft to run plumbing. Planning to shoot it out on the drivers side between underbelly storage and rear wheel. Just have to make sure its far enough from the exhaust not to melt. Should be enough space though.
Well the driveshaft moves by the maximum suspension travel of the rear axle, but only at the axle end. At the gearbox it doesn't move at all, and halfway along it moves by half the travel.

You can attach string to the top of the trans joint, and move it up and down at the axle end to check the clearance.
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