Gee Mike, you have been proven to be wrong on virtually all points, And deceiving with your "non-facts". You have more what ifs in your post than Chicken Little could dream up.
The F150 HD (which are all long wheelbase models, including the Supercab), has a thicker (.150") frame, as I inferred. It specs out a lot beefier than the standard F150 frame. Care to post the comparable F250 frame specs? Hmmm? The rear 9.75 axle has a rep as super tough. And the CC F150 HD still has a rear axle load capacity of in excess of 2500#, so after connecting the fully loaded trailer, the OP could still add 1500# of stuff people, junk etc, in the box, in the cab, or both.
The trailer the OP mentioned is easily managable, when fully loaded. Tongue weight is a "managed" number, any time you add load. So keeping the tongue weight around 1K,(12.5%) is both feasible, and safe, and gets an appropriate amount of load on the truck, and trailer.
Bottom line, Mike is either deceiving, twisting facts, or inserting opinions as "facts".