transferred wrote:
Re tires, my SRW 2005 Ram 3500 has E-rated tires at 3,750 lbs apiece so I have 15,000lbs of total tire capacity and 7,500lbs per axle. Point being tires are not the limiting factor.
Your 2005 Ram AAM rear axle has a rating around 10K lbs, so your rear tires are a limiting factor of what you can carry on the back of your truck. I don't believe your front axle is rated for much more than 6000 lbs, so those tires on the front are not limiting you. If my numbers are right, your GAWR is around 16k lbs if you have sufficiently rated wheels and suspension. Due to your current wheels, you are limited to 13.5K lbs GVW if loaded properly.
My 2005 Ford had a Dana 60 front axle rated at 7250 lbs and rear Visteon Sterling 10.5" axle rated at 9750 lbs, so you have to know the components used in YOUR truck if you want apply upgrades that will help your carrying capacity. This truck had a 17K lb GAWR, but was limited to 16,250 lbs GVW due to my choice of rims.