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Old 02-21-2013, 06:37 PM   #11
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Originally Posted by gbaglo View Post
I understand.
But, what is my tongue weight?
320# plus 64# or is it less because the WDH is employed?
Glenn - have you found a new hobby in retirement? The science of WDH's in relation to tongue weight!
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Old 02-21-2013, 06:38 PM   #12
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Originally Posted by Brian B-P View Post

WD doesn't reduce tongue weight at all - it applies forces to make the tug's front axle and the trailer axle carry more, while the tug's rear axle carries less. You do that because of the high tongue weight. The WD's action actually greatly increases the load on the ball.
That's an interesting statement because the factory installed Class 3 hitch on my truck has the following stamped on it. Weight Carrying 350 lbs tongue 3500 lbs total, Weight Distributing 600 lbs tongue 6000 lbs total. Can anyone figure out why that is?

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Old 02-21-2013, 06:48 PM   #13
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Here is a source which might help. I haven't quite wrapped my mind around it yet:

RV.Net Open Roads Forum: Towing: Weight Distribution (WD) Hitch --- How it Works

According to this source, a WDH does not change the tongue weight. This contradicts my statement. I stand corrected.
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Old 02-21-2013, 07:00 PM   #14
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I just think of a WDH as a lever arm that is transferring forces - it raises the rear of the tow causing weight to be transferred to the front. When Reace installed ours he measured the height of the hitch off the ground without the trailer attached. Then he attached the WDH and adjusted it until the hitch was the same distance off the ground as it was without the trailer. So, to me, that would mean that the WDH was transferring weight off the hitch thereby making the "virtual" tongue weight less. (Phew, I need a beer after that, and maybe it is total BS)
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Old 02-21-2013, 07:06 PM   #15
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Glenn - have you found a new hobby in retirement? The science of WDH's in relation to tongue weight!
It's raining. It's cold. I have hemorrhoids...

Looked at the link. And, I still don't know if my tongue weight should include the weight of the WDH itself or not. I'm going to pretend not.

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Old 02-21-2013, 07:22 PM   #16
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The t/w is a function of the trailer, adding the t/w and w/d weight is a function of your tow vehicles carrying capacity. The w/d is like having a person lift up your rear end to shift weight to other axles. The weight is always there.
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Old 02-21-2013, 10:22 PM   #17
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Originally Posted by gbaglo View Post
I understand.
But, what is my tongue weight?
320# plus 64# or is it less because the WDH is employed?
320# plus 64#

... although once you start cranking on the vehicle structure with the WD spring bars, the exact value won't matter much, because the WD forces will be so large.
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Old 02-21-2013, 10:26 PM   #18
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You thought I was done, didn't you?
So, if the bars are 26# and the WDH is 38# and the trailer tongue is 320# then would the tongue weight be 320# plus 26# or 346#?
Not that it matters once the bars are deployed.
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Old 02-21-2013, 10:30 PM   #19
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Originally Posted by barry View Post
... the factory installed Class 3 hitch on my truck has the following stamped on it. Weight Carrying 350 lbs tongue 3500 lbs total, Weight Distributing 600 lbs tongue 6000 lbs total. Can anyone figure out why that is?
In weight-carrying mode, the rear of the hitch is being pulled down, and the front pried up in response. In weight-distributing mode the upward prying of the spring bars reduces the downward force on the rear of the hitch and pushes the front down, changing not just the magnitude but the direction of forces on the hitch structure. Since vehicles can handle more tongue weight when the WD system is used, hitch receivers are designed to handle more weight when the forces applied to them are in the directions of the WD mode.
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Old 02-21-2013, 10:40 PM   #20
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Originally Posted by cpaharley2008 View Post
The w/d is like having a person lift up your rear end to shift weight to other axles.
Yes, although I'd say "the w/d is like having a person lift up your rear end, while standing on the trailer tongue, to shift weight to other axles".
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