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Old 03-12-2013, 01:47 AM   #51
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Brian, I figured that the truck scales could be really off for just the reason you are giving. Our difference, however, has only been 20-40 lbs. compared to the Sherline so that doesn't seem bad. But when it comes to the bathroom scale, well, I don't like it a bit! I think I'll just stick with the Sherline.

Glenn, how unlevel are you? Did you ever take the TW at home and then get it at a campground to see the difference? If you were to do that a couple of times, you might then have a good idea of what your TW actually is at home. At least I'm assuming you would. Does that make sense?
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Old 03-12-2013, 02:04 AM   #52
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I have to repeat. The trailer is level. The driveway is not. The scale is also pretty much on level. So, I fail to see what effect the slope of the driveway could have on the scale. Even though it is pouring rain for the next five days, I'll take photos.
And, before I got the Sherline, I tried a bathroom scale, now an ex-bathroom scale...
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Old 03-12-2013, 02:18 AM   #53
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Gbaglo et all.. I've never weighed a trailer or a hitch weight but I now have 53 variations to consider before i go anywhere. Can it really matter if things are on level ground so long as everything is "levelled" or do the forces at the wheel chocks come into play?. Just thought I'd ask
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Old 03-12-2013, 02:20 AM   #54
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Glenn, what Brian is saying is that the trailer has to be on level ground. I believe he is correct. I get what you are saying about the trailer being level but apparently the ground has to be level also. It doesn't have to be perfectly level but at least more or less. I am not a scientist so I can't give you a good explanation for it but it's something to do with the way the stars are aligned above Canada.
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Old 03-12-2013, 02:30 AM   #55
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Quote:
Originally Posted by Dixhiccup View Post
. Can it really matter if things are on level ground so long as everything is "levelled" or do the forces at the wheel chocks come into play?. Just thought I'd ask
I don't know about the chocks, but, I'm now a dog with a bone, and, I'm retired, so what else do I have to do?

Think about it this way though. If you have a teeter totter and the centre is on level ground, is it going to behave any different than if the centre is on a slope? One end can go up further from the ground, but whatever is sitting on that end is going to weigh the same as if it was sitting on the other end.
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Old 03-12-2013, 02:39 AM   #56
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Glen. You have no idea how my iPad and a pencil have been angled trying to figure it out. Now I'll go dream teeter totters. Thanks for all the advice everyone. I still think "level" is good. Cheers
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Old 03-12-2013, 04:42 AM   #57
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Just to be clear, we're talking single-axle here, right? With a dual axle like the 19, the slope of the ground would be important.
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Old 03-12-2013, 04:54 AM   #58
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Old 03-12-2013, 09:20 AM   #59
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Quote:
Originally Posted by Brian B-P View Post
The ground where you are measuring the the tongue weight needs to be level. If the whole rig is tipped back by pointing uphill, the tongue weight will be lower (just as it really is when climbing a grade) and conversely if it is tipped forward the tongue weight will be higher (just as it really is when descending a grade).
In baglo's case (or any single axle), this is not true. As long as the trailer is level, the tongue weight acting straight down (towards the center of the earth) will be the same as it would on level ground.

Quote:
Originally Posted by gbaglo View Post
If the trailer ( single axel ) is level, how does the scale know that the ground below the trailer is not level?
My trailer is leveled and chocked. The ammo box I use to raise the jack and scale is actually on the road, so it is also pretty much level.
As long as the trailer is not nose up or nose down, I should get the same reading regardless of ground slope.
You're gonna force me to do it again so I can shoot pix and post them.
You know it pains me to have to agree with you, right?
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Old 03-12-2013, 09:27 AM   #60
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I agree that truck scale error in tongue weight may not be a big deal, but in my case 40 pounds is 13% of my tongue weight... it's all relative.

Quote:
Originally Posted by gbaglo View Post
If the trailer ( single axel ) is level, how does the scale know that the ground below the trailer is not level?
Trick question: the answer is "it doesn't", if
  • the wheels are chocked (it is as if they are sitting in divots on level ground),
  • the scale's base is shimmed level so it is measuring vertically, and
  • the trailer is at the same angle to the horizontal as it is when in the situation you are trying to check - the towing position - which is rarely exactly level
I simplified the situation to level ground because
  • if you start with the whole rig (tug and trailer) you need level ground for a reference coupler height
  • Doug's original question was for a tandem axle trailer - applying Glenn's (correct) logic to this case would also require shimming under the trailer tires to get the two suspensions equally compressed (or actually in the same proportion as at the desied towing attitude)
  • most people seem to have enough difficulty with this that only Baglo would want to make it more complicated

Pictures are always good, but don't bother on my account...
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