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Unread 10-15-2013, 01:22 PM   #1
RowJ
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1998 TJ Wrangler 
 
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Water Logged Trailer deck??

I just had cause to re-weigh my truck, Jeep & Trailer.
Identical setup 2 weeks ago was 13,800 lbs total
Yesterday, weighed 600 lbs more?????
Same scales (state scales at a Tx truck weigh station)

Only change between two weigh-ins is I put the soft top back on and.....
heavy rain the days before(trailer outside) and light drizzle during second weighing.
Any ideas??

RJ

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Unread 10-15-2013, 03:06 PM   #2
Indy
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The deck would have had to absorb 72 gallons of water to gain 600 pounds. That's a lot of water. Odds are there is a margin of error in the scale coupled with some water weight.
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Unread 10-15-2013, 04:18 PM   #3
N128CG
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What about fuel?
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Unread 10-15-2013, 07:33 PM   #4
thantos858
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Quote:
Originally Posted by Indy View Post
The deck would have had to absorb 72 gallons of water to gain 600 pounds. That's a lot of water. Odds are there is a margin of error in the scale coupled with some water weight.
State certified scales aren't off that much unless they are broken which is likely. The one I use at the dump was off by 20lbs from the DOT scales. More than likely it was the scales. Doubt you can put 600lbs with a soft top, fuel and a bit of rain. gas weighs only 6.073 lb/gallon soft top is probably 100-200lb.
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Unread 10-16-2013, 08:21 AM   #5
RowJ
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Quote:
Originally Posted by Indy View Post
The deck would have had to absorb 72 gallons of water to gain 600 pounds.....
Yup.... I figured 75 gal. Just not possible on a treated deck, no matter how old.
Both were full fuel!
Soft top is probably not even 50 lbs.
Maybe some water on scale surface would affect readout?
It's a mystery! Guess I need a third weigh-in to see.

RJ
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Unread 10-16-2013, 09:57 AM   #6
wilson1010
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DOT is + or - 1%, by DOT Regulation.

Most scales are less accurate at the low end of their weight range given fixed errors with variable weight to compare. In other words, a postage scale that is off 1/100 oz. because of friction is only 99% accurate when weighing a letter weiging an oz. And, when a 3 pound pagage is on there it goes up to 99.9%. So, if a truck scale has to be 1% accurate when weighing a truck, by regulation, it might be off 800 pounds. Certainly, one would not expect the 1% to apply if one put a 600 pound motorcycle on the scale.
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Unread 10-19-2013, 10:30 AM   #7
RowJ
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Quote:
Originally Posted by wilson1010 View Post
.......Most scales are less accurate at the low end of their weight range....
Good point, and yet..... I have weighed my Dodge/Cummins pickup (by itself) a few times on two different State scales and with me and full fuel it always come out +/-50 lbs of 7700 lbs.
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