01-08-2009, 06:38 PM
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 | Hazardous Waste | | Join Date: Sep 2006 Location: South Central kansas
Posts: 5,787
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Here's some interesting info about all this stuff from a discussion we had at the cummins site. 5TH wheel towing question - Cummins 6.7L Forum Quote:
The following is how to calculate the realistic towing capacity of the vehicle that interests you.
For example: Consider a fictional one-ton longbed, diesel, extended cab, 2WD, single-rear-wheel pickup set up for towing. We’ll arbitrarily assign it a gvwr of 9,900 pounds, a front gawr of 5,000 pounds, a rear gawr of 6,824 pounds, a gcwr of 23,000 pounds and a quoted maximum tow rating of 17,000 pounds.
As is often the case in single-rear-wheel trucks, the rear axle’s gawr on this truck is derived from each tire’s maximum load of 3,412 pounds. Pickups such as this normally start at more than 6,000 pounds, and with a diesel, automatic and nice trim, figure that with a full tank of fuel and hitch, this unit weighs 7,000 pounds. If we add two “standard-size” people (154 pounds each), a few tools and some cargo, it weighs 7,500 pounds. That is split to 4,000 pounds on the front axle, and 3,500 pounds on the rear axle. The first thing you should have noticed is that the maximum tow rating cannot apply with the truck fully loaded because gcwr (23,000) minus gvwr (9,900) leaves 13,100 pounds -- about two tons less than quoted towing ability. After adding options and people to the example truck, and subtracting that value (7,500) from gcwr (23,000), the effective working tow rating of the truck becomes 15,500 pounds, about 1,500 pounds less than the truck’s quoted maximum towing rating.
However, you have yet to check all the numbers and verify that a 15,500-pound trailer will work. If that trailer is a fifth-wheel and has 20 percent of its weight on the pin, that adds 3,100 pounds to the back of the truck. This would make the truck overweight -- its 7,500-pound ready-to-roll weight plus the 3,100 pounds on the pin equals 10,600 pounds -- 700 pounds more than the truck’s gvwr, and just 224 pounds shy of the rear-axle limit of 6,824 pounds.
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6 x 10' low bed/rails trailer with E-brakes, 100 year old rebuilt 4,000 lb. road roller/packer 
Linear Mode
