Groover, you should do a little reading and arithmetic regarding the various capabilities of different model light duty trucks and then you’ll see why LT tires don’t need to be spec on 1/2 tons for the most part....
That said I also believe that LR D or E tires are a nice match for 1/2 tons that see heavy use or abuse to tires. It’s a good kind of overkill in some situations. Not the least of which is tire life if one is counting cost benefit ratio.
I don’t believe in the poor ride of a E tire on a 1/2 ton thing. Aired up or down to the right psi for the load negates that claim. Unless you’re really wanting your 400hp trailer towing 1/2 ton to ride like a ‘75 Buick. In which case, you should also remove the shocks from your F150 and throw them in the garbage for the full effect!
All this said, I’ve towed and hauled a lot of “stuff” with half tons on OE P tires, well over all of the book “ratings” and they work. They even work better when you give an a boost in pressure to 55-60psi!! Oh the horrors...