Yes sir! Same thing with all my trailer tires.
I am very **** about tire pressures. I lower them down in winter unless towing but keep them up the other 9 months.
This is not a ford specific issue but I see you want to make it one.
OOH boy -I've gone and done it now, I was not trying to start a Ford, Chevy war here.
But it just seems odd that ANY truck with a high tow rating, and fairly high payload would actually put a P rated tire on a vehicle that potentially could be used for (example) to say move a family on a long trip through the desert heat, fully loaded with a loaded trailer, those sidewalls are going to get hot (4 ply rated?) especially if run at the sticker specified 35 psi. It would make me somewhat nervous after running close to 70mph for hours in the heat, then descending a mountain grade- with the brakes on, wheels begin to get hot sidewalls will be under a lot of stress flexing keeping the speed down and loaded to max rating this just sounds like a recipe for an accident..
As far as the Firestone tires go - I think the blow out part rests mostly on Firestone , anybody old enough to remember the Firestone (500)? how many people were killed by those tires-they would separate the tread and then boom, tire shrapnel.
Now I will probably take heat for this, but- if most of the readers of this worked at a rental yard and someone shows up with a a truck, with what can be called car tires, would you let them rent a heavy piece of equipment and drive away with it... I can see why they might put a blanket policy in place, to exclude 1/2 ton trucks...