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Old 04-15-2014, 09:23 AM   #11
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Originally Posted by Shorty Cox View Post
I'm so sorry if I used the wrong term....Tongue weight, pin weight, I really didn't think it would offend. I was just trying to determine how much weight was being placed on the tow truck. I didn't know it would matter if that weight was being placed on the bumper or in the bed.
First I'll echo the not being offended sentiment. I think it's safe to say that we don't offend easily when someone is trying to learn something and may not know the exact terms; it's all part of the process. As I have found, people on this forum are generally very helpful, especially given accurate information; the advice given greatly depends on accurate information. None of us knows everything, but there is a LOT of knowledge on this forum.

Incidentally, it does make a difference when you're weighing a 5th wheel setup (pin weight) vs a Travel Trailer (tongue weight). The 5th wheel pin weight sits right over the rear drive axle, and there is no opportunity for weight distribution. It's a binary question; trailer on vs trailer off.

The TT hangs a few inches out behind the bumper which creates leverage on the rear of the vehicle lifting the front, which is where a Weight Distribution hitch comes in. When you weigh a setup with a TT and a WDH, you need to pay close attention to the steer axle weights so you can maintain steering control by returning any weight lost due to that leverage to the front steer axle. The setup matrix is no longer binary; the WDH needs to be adjusted properly.

The process is similar, but there are a couple more considerations when you're dealing with a TT and WDH.
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Old 05-29-2014, 02:58 PM   #12
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Finally got to weigh the rig.

Truck (ready to go) weighs 6840lb
Combination of truck(ready to go) and RV (ready to go) weighs 17420lb
RV(ready to go) weight hooked to the truck with only the RV's wheels on the scale is 8480lb.

If my math is correct, combined weight, less truck weight, less RV wheel weight, equals weight of the RV on the truck.

As example, If combined weight is 4lb, less truck weight of 1lb, less RV wheel weight of 2lb, means the truck is hauling 1lb of the RV's weight.

Is my thinking correct?
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Old 05-29-2014, 03:49 PM   #13
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You have to weigh the rv unhooked too, or the truck with the rv attached but not on the scales. you're not accounting for how much hitch weight you have.
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Old 05-29-2014, 05:01 PM   #14
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Quote:
Originally Posted by Shorty Cox View Post
Finally got to weigh the rig.

Truck (ready to go) weighs 6840lb
Combination of truck(ready to go) and RV (ready to go) weighs 17420lb
RV(ready to go) weight hooked to the truck with only the RV's wheels on the scale is 8480lb.

If my math is correct, combined weight, less truck weight, less RV wheel weight, equals weight of the RV on the truck.

As example, If combined weight is 4lb, less truck weight of 1lb, less RV wheel weight of 2lb, means the truck is hauling 1lb of the RV's weight.

Is my thinking correct?

Fifth wheel right? The math looks good to me assuming you weighed the truck alone with nothing attached. The number I get for pin weight is 1920. Take that divided by 10,400 FW weight (17420 GCVW-6840 GVW TV) and you get about 18%. I don't deal with 5ers very much, but 18% seems a bit light...? I understood you were supposed to be between 20-25%...?
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Old 05-29-2014, 05:40 PM   #15
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Interesting thread that got me thinking.
as a TT owner (not 5er), I would need 6 weights across the scales
hitched w/WD attached. first pass onto scale:
1) TV front axle on scale
2) TV front and back axles on scale
3) TV and TT on scale

unhook WD bars and start to drive off
4) TT axles on scale

unhook and park trailer. second pass onto scales
5) TV front axle on trailer
6) TV front and back axle on trailer.

Important weights of concern are:
GCVW = 3
TV GVW = 3-4
TT GVW = 3-6
TT tongue weight = 3-4-6

you can then use the other numbers to determine effectiveness and loading of your WD bars.
TV front axle loading = 1-5
tongue loading = 3-4-2
back axle loading = (2-1) - (6-5)
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Old 05-29-2014, 09:42 PM   #16
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Quote:
Originally Posted by tjpolsin View Post
Interesting thread that got me thinking.

as a TT owner (not 5er), I would need 6 weights across the scales

hitched w/WD attached. first pass onto scale:

1) TV front axle on scale

2) TV front and back axles on scale

3) TV and TT on scale



unhook WD bars and start to drive off

4) TT axles on scale



unhook and park trailer. second pass onto scales

5) TV front axle on trailer

6) TV front and back axle on trailer.



Important weights of concern are:

GCVW = 3

TV GVW = 3-4

TT GVW = 3-6

TT tongue weight = 3-4-6



you can then use the other numbers to determine effectiveness and loading of your WD bars.

TV front axle loading = 1-5

tongue loading = 3-4-2

back axle loading = (2-1) - (6-5)

Except that a standard CAT scale has 3 pads, so you only need 3 passes to get all the numbers you need. One with truck loaded for a trip, one with trailer attached and WDH not engaged, last one with WDH engaged. Each time you go across, you weigh the steer axle on the first pad, the drive axle on the middle pad, and the trailer axle(s) on the third pad.
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2015 RAM 2500 6.4L HEMI, Tradesman 4x4, 3.73
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Upgraded from an REI internal frame backpack and a Eureka 1/2 dome tent!
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Old 05-29-2014, 10:07 PM   #17
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sorry, I was thinking of the full-length truck scales.
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Old 05-29-2014, 10:57 PM   #18
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Quote:
Originally Posted by tjpolsin View Post
sorry, I was thinking of the full-length truck scales.

No apology necessary!

The standard CAT scale found at truck stops all over the country is a full length scale, it's just broken into 3 pads, each section reports it's own weight. Around here we have a lot of DOT weigh stations and if I understand them correctly, they are one large pad, but they are also not useable when not attended by the State Troopers...

There is also a scale at the scrap metal collection yard for our local steel mill, it also is one large pad.
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Upgraded from an REI internal frame backpack and a Eureka 1/2 dome tent!
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