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Old 09-16-2020, 04:50 PM   #1
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TV and Trailer Weights

I had the truck weighed empty, full tank fuel and wife.

2007 Silverado 3500 LB dually Duramax:
Steering axle 4540
Drive axle 3460
Total 7980

Then hooked up 5th wheel

truck and initial loaded 2013 Blackwood 36RL13
Steering axle 4540
Drive axle 6320
Trailer axle 10140
Total 21000

Looks like the pin was about 2900 and total trailer about 13000.

Once the complete weight was on the pin, the truck was level and the trailer was about as level as I could tell.

On real question, just thought I'd post this.
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Old 09-16-2020, 11:00 PM   #2
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Quote:
Originally Posted by StevenW View Post
I had the truck weighed empty, full tank fuel and wife.

2007 Silverado 3500 LB dually Duramax:
Steering axle 4540
Drive axle 3460
Total 7980

4540 + 3460 =8180#


Then hooked up 5th wheel

truck and initial loaded 2013 Blackwood 36RL13
Steering axle 4540
Drive axle 6320
Trailer axle 10140
Total 21000

Looks like the pin was about 2900 and total trailer about 13000.
6320-3460=2680 pin weight
21000-8180=12820


Once the complete weight was on the pin, the truck was level and the trailer was about as level as I could tell.

On real question, just thought I'd post this.
Math error on truck only weights
Were those numbers right from the weight ticket??
200# difference? 7980 vs 8180
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Old 09-17-2020, 06:22 AM   #3
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I am seeing 2,860 difference on the drives. Very suspicious the steers didn't change at all? Now that I look at it closer. There is a lot of math wrong there.
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Old 09-17-2020, 07:48 AM   #4
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I Hope the OP comes back.

Is it normal for steer axle to not change .........
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Old 09-17-2020, 10:03 AM   #5
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Quote:
Originally Posted by PulNSerenity View Post
I am seeing 2,860 difference on the drives. Very suspicious the steers didn't change at all? Now that I look at it closer. There is a lot of math wrong there.

Yep*^^^^
y math was wrong on pin weight
S/B 2860#

No changes on front axle weight is suspicious but depending on what scale was used ....50# is acceptable
Front axle may have dropped some weight or might have added some weight depending on placement of hitch over rear axle

Dud to hitch placement my King Pin is 2" forward of rear axle center line...adds 150# to front axle when 5vr is hitched
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Old 09-17-2020, 03:45 PM   #6
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Ok.. I didn't account for the -20 trailer axle on the truck only numbers. The numbers are:

SA 4540
DA 3460
TA -20
Total 7980

I did make math error on pin. However, not sure what to say on steer. This was a CAT scale so assuming it's correct. I am using an Andersen Ultimate Hitch with is slightly off set to the rear.
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Old 09-17-2020, 06:31 PM   #7
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Quote:
Originally Posted by StevenW View Post
Ok.. I didn't account for the -20 trailer axle on the truck only numbers. The numbers are:

SA 4540
DA 3460
TA -20
Total 7980

I did make math error on pin. However, not sure what to say on steer. This was a CAT scale so assuming it's correct. I am using an Andersen Ultimate Hitch with is slightly off set to the rear.
Thanks for coming back.

I am not a 5er expert, so the drive axle weight staying the same seems crazy to me from a physics point of view, especially on a LB. I would have expected far more increase there - 10-20% of Pin weight or something?
Thanks for the real world data.
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Old 09-17-2020, 08:08 PM   #8
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My experience with the Andersen Ultimate Hitch is that even though it is mounted to a ball/pin mount the weight is displaced over about a three square foot area and the drive axle takes most of the weight. The difference in my set up between ULW and TLW was only 40 lbs. to the steer axel. I too wondered if this was normal.
Final thought, on my setup with the 6.7 diesel I did not have a lot of room for weight transfer to the steer axle anyway and most of my weight capacity was in the bed of the truck.
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Old 09-17-2020, 08:19 PM   #9
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Is it normal for steer axle to not change .........
Of the three trucks and 5th wheels I've owned, all of them showed very little change to the front truck axle weight. One went up 150lbs when the 5th wheel was attached. The other two didn't change at all.
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Old 09-18-2020, 08:03 AM   #10
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Quote:
Originally Posted by bertschb View Post
Of the three trucks and 5th wheels I've owned, all of them showed very little change to the front truck axle weight. One went up 150lbs when the 5th wheel was attached. The other two didn't change at all.
Interesting. 150 I can understand (although would expect a bit more). I am really shocked to hear how common no change to front axle is.
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Old 09-22-2020, 08:19 PM   #11
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Sorry if I'm late to the party (again).
I don't have the figures in front of me, but the difference on my steers was +20 lbs with the trailer on the pin.
Been weighed at a Cat scale, and a 4 corner weigh-in at an Escapees Smart Weigh.
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Old 09-23-2020, 05:17 AM   #12
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I think if I were to either reverse the Andersen hitch, king pin adapter, or both there would probably be a slight difference between the 2 axles.
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Old 09-23-2020, 07:34 AM   #13
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Quote:
Originally Posted by TB673 View Post
Sorry if I'm late to the party (again).
I don't have the figures in front of me, but the difference on my steers was +20 lbs with the trailer on the pin.
Been weighed at a Cat scale, and a 4 corner weigh-in at an Escapees Smart Weigh.
Thanks for the data. It's fascinating to me.

Interesting for 2020 GMs new gooseneck ball, (and by extension typical 5er pin) location has been moved back a few inches behind the rear axle. They say it doesn't do much to weight distribution. Shows just how much bed mount vs. bumper mount changes things.
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