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Old 05-17-2012, 05:37 PM
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PteJack PteJack is offline
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Join Date: May 2012
Location: Alberta
Age: 60
Posts: 21
Gender: Male
Vehicle: 2013 3500 Laramie LongHorn DRW
Trim Level: Longhorn
Color: Western Brown/Gold
Engine: 2011-20?? 409ci (6.7L) Cummins Turbo Diesel 350hp 800lb/ft
Rep Power: 0
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I think I found the error in my math, I am assuming that there is no weight transfered from the trailer to the truck... DOH!!!

The only real way of determining if the trailer is TOO heavy is to actually run it across a scale...


The unit dry weight is 10820, if has a pin rated to 2069 (assumption I still don't know if this is actual dry or a max rating and I am trying to find that out)

Truck has GVWR 10,100, FAWR 5500 and RAWR 6500. The GCWR is 21000 and has a TWR (Tow Weight restriction) of 13500.

I run the scales without the trailer and find I'm weighing 8118lbs FA 4906 RA 3212

I hook up and run the scales and find I weigh 10000lb FA 5000 RA 5000

This mean the trailer is pushing 1882 lbs to the truck and the trailer weight should adjust from 10820 to 8932 (if I haven't added any weight to the unit)

Now doing the math

10000+8938 = 18938 (-2062) Under GCVR
5000 + 5000= 10000 (-100) Under GVWR
King pin is already figured into the GVWR at 1882 but IF Dodge KingPin Capacity is set to 15% of the towing capacity (Ford and Chev are 25%) then King Pin weight can be 3375lbs so I'm under by -1493

I'm -500 on the FA, -1500 on the RA and with a GVWR of 15500 on the trailer I'm under by -4680

Verticle Load percetage on the Kinpin would be 17%

This is how you justify a 3500 to tow a 10-12000 lb 5th wheel

Would this also be the way an enforcement agent would rate the combination??


Pte Jack
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