I am running a 2005 Dodge Ram 3500, Cummins Diesel, SRW, auto, 4X4, tow package, etc. The specs on the 2005 show a tow capacity of 13,950. For the 2006 version of the same vehicle, the tow capacity is 13,800. Both have the same GVWR of 9,900 lbs. The vehicle weight of my truck is 3,490 kgs (7,678 lbs) with a full tank of fuel, SuperGlide hitch, and myself. When I add my wife, clothes, etc and the 5er's pin weight of approximately 2,000 lbs, I am right at the truck's GVWR of 9,900. I am hauling a 5er with a GVWR of 13,960 lbs.
Clearly, I am pushing the limits for this truck and would be extremely reluctant to go to a bigger 5er without moving up to a bigger TV as well. There is no question that the Cummins will pull this load. I am not sure how the auto-tranny is going to hold up but so far, so good.
In my opinion, and as others on this Forum have pounded into my head on more than one occasion, the question which should be first in the minds of people looking to buy a new truck is not whether the truck can pull the load (most of the new diesels will do that with no problem) but whether the truck can properly CONTROL the load.
Bill