Towing Capability

caberto wrote:
Your truck can "pull" that 5er just fine. It's the pin weight that will be the biggest factor, but even with factory tires, you'll see that you are either fine (comfortably under your RAWR), or can be fine by replacing the factory tires.

The RAWR of your truck I think you said is 6100 as indicated (with the standard factory tires); that rating is limited by your rear tires' load capacity. Weigh your truck as you would have it loaded for towing, get your actual rear axle weight and subtract that from your RAWR of 6100 lbs. That's what you have left over for pin weight with the standard factory tires.

If you replace the factory tires with larger/load range E tires, you will effectively increase that 6100 RAWR by the combined load range on the bigger tires at max PSI. Will you be over the truck's GVWR? Probably, but probably not by much, the main number you are concerned with is the RAWR (some will argue this point, this is the big debate, so the final decision is up to you). Stay within that RAWR and you will be fine. As others have said, the only difference between 3/4 and 1 ton trucks is almost always an added leaf spring and overload block (and that's what give the single wheel 1 ton the higher GVWR), but a set of air bags will remedy that inequality if your truck happens to sag a little due to the missing leaf spring.