7.3, dually, 4.56:1, 9,000 payload capacity. The only weak part is the tow rating, as there is no tow rating specified for 5th wheel or gooseneck (most have bodies put on them that don't allow for these hitches). The bumper pull rating is only 7500 lbs. Considering the GCWR and the curb weight, a stripped-down version should be able to pull a 16,500 lb goose... but probably more, considering they never thought to add anything higher than the GVWR + bumper pull rating for the GCWR. I mean, what would the tow rating be for a 2WD 7.3 dually with 4.56 gears? Probably pretty similar (the F450 7.3 is listed at 37,000 lbs gooseneck).