Also, under the be careful note - just slapping a cooler on a truck doesn't make it just as capable as a truck properly equipped.
On the F150's, depending on the packages selected, you can get different axles with different rear brakes (even with the same engine), frames with different thicknesses and weight ratings (there are at least three thicknesses used on the F150), different receiver hitches (at least two of them), and that doesn't even get springs and sway bars...
Easy to call them all apples, but there are a lot of difference that matter in there...