[twindman]

The standard 20 or 22% of GVWR for hitch weight is ballpark. I kind of wondered and had an epiphany today. My rig has GVWR of 14,050. I only load it to about 13,500. The manual specs say pin is 2055. (of course that is empty). My pin wt. is around 2400-2500. So 20% of 14K is 2800 lb. Why am I so light. 2500/13500 (actual numbers) my pin wt. is 18.5%

So I think the axle placement should also be considered, which is what the specs sort of do. So I think you should kind of look at the specs to see how a particular unit compares to the others. i.e. Same year mountaineer that is 18" longer has a listed pin wt. of 2700 lb. That is 650 lb more for only 18". So maybe a sliding scale after looking at the specs vs. other units.