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Old 03-31-2010, 06:53 PM   #15
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A large majority of the motorhomes have the fresh water tank under the bed and is aft or to the rear of the rear axle. Adding 30 gallons of water at 8.33#/gallon is over 240# of weight behind the rear axle. Now think of a see-saw and when you add weight to one end, it lifts the other. Also think of a lever and how you can use it to multiply the effect of a force.

Ken
Is the other 2/3 h2o in the grey or black holding tank to the front of the rear axle? Where did it go in between weighing the two times?
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Old 03-31-2010, 08:07 PM   #16
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theres abetter way to reach the button you have to push instead of leaning out the window.bring a long stick with you (ex. broomstick) just stick it out the window and push the button .
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Old 04-01-2010, 12:00 AM   #17
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The last time I weighed my rig at a Flying J, the only button I pushed was the SEND button on my phone. I just called inside and told them when I was on the scale.
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Old 04-01-2010, 06:54 PM   #18
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It looks like the holding tanks are in front of the rear axle. There was many months between the first and second weights.

Good suggestion regarding a broom handle to reach the speaker button.

Thanks,
RJ
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Old 04-02-2010, 03:25 PM   #19
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I think your weight difference has been accounted for.
(1) The wife was sitting right over the front axle and every lb bears directly on it.
(2) The lack of water in the tank (behind the rear axle) reduced the lift on the front axle, increasing its apparent weight by some amount between 240 and 480 lbs (30-60 gallons of water)

Plus any other weight added toward the rear but still ahead of the rear axle ADDed something to the front axle weight, however little.

Growth in weight is a common phenomena - we add a few things here and there and don't ever realize how much it adds up until we weigh again.
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Old 04-02-2010, 04:09 PM   #20
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The more weight you carry low, the lower center of gravity, the better the handling.
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Old 04-02-2010, 04:32 PM   #21
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Damn standardizations of imperial measures....
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Old 04-02-2010, 04:37 PM   #22
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Old 04-02-2010, 04:55 PM   #23
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Damn standardizations of imperial measures....

Need to check your facts here. Water is 8.329#/U.S. gallon at 70dF. HERE

Fresh water has a density of one gram per cubic centimeter (1 g/cm3). Seawater is more dense than fresh water, because the ions dissolved in seawater are made up of atoms that are denser than hydrogen and oxygen, the components of water.

Average density of fresh water at standard condition is 62.4#/ft3 and sea water is slightly denser at 64 #/ft3....so sear water will be 1.0256 times heavier or 8.542#/gallon.

Ken
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Old 04-02-2010, 05:22 PM   #24
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Yeah, like I said...

Historically, one pint equalled one pound. That was the original definition of a pound (or a pint, I can never remember which). Then they actually standardized them and got an odd number.

The metric definition is exact, because they were defined that way from the beginning.

Oh well.

joe
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Old 04-02-2010, 06:54 PM   #25
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.

Someone pointed out that his information indicated his front axle was 7500 lb GAWR. I started checking and the Tiffin sticker about foot level on the drivers side wall indicates a front axle of 7000 lb and rear 13,500. I dug through all the paperwork/documents and found what I call the "spec sticker" This had the VIN vehicle description (F550) and to the right the Optional Equipment list. Listed was a Preferred Equipment Pkg.696A 19.5 tires, 20,500 GVWR Package, Heavy Duty Front Track Bar and 7500 lb Front GAWR. Thus it appears that I have a 7500 lb front axle even though the Tiffin sticker indicates 7000 lb. It's a little confusing since under optional equipment 20,500 GVWR Package is shown. But if I actually have 7500 lb on the front, the actual GVWR would be 21,000. I think it's just two separate options, one the 20,500 package and two the 7500 front axle option for a 21,000 GVWR. I did find another sticker indicating the chassis was manufactured in 11/07 but the 10th digit in the VIN number is '8' indicating an 08 chassis.

It's a little confusing but I think the bottom line is I have 7500 on the front axle and with that figure I'm not over weight on the front.

RJ
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