Some of the confusion here may be thinking that all F-250's are created equal. They are not. Capacity depends on what options or configuration was chosen for each vehicle. If you buy the F250 with the lower payload, you do not get the F350 springs. The axles are the same. Order the F250 with the 10000 GVWR, and you get a F350 with 2" spring blocks and F250 badging. The camper package can be added, and that gives you the rear sway bar, and the helper springs if you did not choose the 10K package (why wouldn't anybody go for the 10K package??). The snow plow package will give the F250 the larger coils in the front.