Most all of FW pin wt will be on rear axle. You just need to have separate axle wts of a truck you are interested in. Lets just guess the rear axle weighs 2800 lbs truck empty. Now look at RAWR on door panel. a 3/4T about 6-6.5K and a 1T about 7-7.5. So 6500 available, less the 2800 leaves 3,700 available to add to rear axle.
If you plan to stay with a small, less than 30' FW, most any late model 3/4T will work. If you may decide later to get a larger FW, best to go with a 1T.
On a HD truck, the axle/tire ratings are more important than the payload sticker.
Jerry
