It was on one of the "First Drive" reviews on the new 2017 trucks. Most likely on
Pickup trucks. I think they had several articles so you may need to scan a couple to find it.
I spotted it in that article:
"The frame, typically designed with nine cross-members (most of which are tubed and through-welded for added strength), will also accommodate a stout 10th heavy-duty cross-member when equipped with the in-bed gooseneck/fifth-wheel hitch option. "
This doesn't apply to you but I thought this was interesting:
"All these class-leading numbers are due in large part to a reconfigured and beefed up rear frame section, which now offers a much stronger 2.5-inch and 3-inch hitch option for HD buyers. We're told these new hitches are so much stronger than the previous designs (or any other hitch in its segment) that Ford no longer recommends weight-distributing trailer hitches to any of its Super Duty buyers. "
