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Old 05-27-2016, 01:15 PM   #11
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There are reports of folks filling their tank(s) and having them 'fall' out.
But... I also bet there are hundreds of folks who fill their tanks and never have a problem. Unless there is a way for you to inspect the tank and the brackets, the only way you will know is to try it.
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Old 05-27-2016, 01:26 PM   #12
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Ditto- OK driving w/ a full tank when no water will be available.
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Old 05-27-2016, 02:26 PM   #13
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What is that tank for?

If you can't travel with it full, then there isn't really any reason to have it. I assume that is what it is for. I always travel with mine full. We mostly boondock.
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Old 05-27-2016, 04:00 PM   #14
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Thanks all. Tank is full and heading out!


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Old 05-27-2016, 05:54 PM   #15
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Here on Long Island, NY, we have excellent tap water. It's rare for me to leave with less than a full tank (110 gallons) of fresh water. Then again, my Super-C Class rig has a GVWR of 33,000 pounds. I have an insane amount of excess capacity / safety margin and, the 350HP Cumins diesel I have under the hood thinks it's on early retirement.
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Old 05-27-2016, 09:26 PM   #16
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Honestly, as an old Naval Officer, you are better off towing with either: (a) a full tank, or (b) an empty tank, than with a partly filled tank; because of what we call "the free surface effect". With a full tank, the center of gravity of the water in the tank will stay pretty close to the center of gravity of your trailer. With a partially filled tank, the center of gravity will shift every time you turn or swerve while driving. This could cause unwanted and unstable swaying of your rig as the water sloshes back and forth in the tank.

This "free surface effect" applies equally to black water and grey water tanks. Best to drain all tanks as dry as possible before heading out on the highway.

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Old 05-27-2016, 10:02 PM   #17
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Originally Posted by Jakie-Boy View Post
Honestly, as an old Naval Officer, you are better off towing with either: (a) a full tank, or (b) an empty tank, than with a partly filled tank; because of what we call "the free surface effect". With a full tank, the center of gravity of the water in the tank will stay pretty close to the center of gravity of your trailer. With a partially filled tank, the center of gravity will shift every time you turn or swerve while driving. This could cause unwanted and unstable swaying of your rig as the water sloshes back and forth in the tank.

This "free surface effect" applies equally to black water and grey water tanks. Best to drain all tanks as dry as possible before heading out on the highway.

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Exactly correct. That's why fire truck tanks are baffled. To minimize the movement of the water. The old tankers we used had no baffles. A half tank of water was almost not driveable. Granted that was substantially more water than an RV will hold but the principle still remains. RV tanks are not baffled and the water sloshing of a partially filled tank can affect cornering and braking.
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Old 05-27-2016, 11:49 PM   #18
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Originally Posted by Jakie-Boy View Post
Honestly, as an old Naval Officer, you are better off towing with either: (a) a full tank, or (b) an empty tank, than with a partly filled tank; because of what we call "the free surface effect". With a full tank, the center of gravity of the water in the tank will stay pretty close to the center of gravity of your trailer. With a partially filled tank, the center of gravity will shift every time you turn or swerve while driving. This could cause unwanted and unstable swaying of your rig as the water sloshes back and forth in the tank.

This "free surface effect" applies equally to black water and grey water tanks. Best to drain all tanks as dry as possible before heading out on the highway.

Anchors Away!!
Thank you skipper,
Now I have the answer for my wife when she insists that with less in the tanks we could get better mileage.

Tom
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Old 05-28-2016, 12:08 AM   #19
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Thank you skipper,
Now I have the answer for my wife when she insists that with less in the tanks we could get better mileage.

Tom
That's a whole different issue - and she's probably right.

So now you have to decide - better mileage or better handling?
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Old 05-28-2016, 12:36 AM   #20
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That's a whole different issue - and she's probably right.

So now you have to decide - better mileage or better handling?
Hey it's a 6.0 diesel so what's 800 lbs more or less? Full it shall continue to be.
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