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Old 03-17-2013, 08:22 AM   #9
wingnut60
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Join Date: Sep 2005
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The axle ratings get a lot of people, myself included, a long time ago. What you haven't considered is the pin weight (weight of the trailer transferred to truck when hitched up) that has to be subtracted from the gross weight. At 18400 gross weight, about 20% will be on the truck when hitched up. 20% of 18400 is 3680 that is on the truck, leaving 14720 on the axles. With 2 8000lb axles, you would have 1280 extra capacity. Besides, almost all 9000lb axles require dual wheels/tires that would complicate the frame layout. That 3680lbs mentioned above is also what you should use when considering the weight capacity of the rear axle of the tow vehicle.
Lots of things to think about when looking at larger fifth wheels.
Joe
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