My experience was quite different. I've pulled my travel trailer all over the northwest, through heavy city traffic up and down mountain passes, everywhere. Those tires were rock solid. Airing P rated tires to max pressure is important when loading or towing. I get the impression that's not done routinely from some around here. 69GWC, I read your post about your experience. I think your truck was seriously over loaded. The pics you post show that at least. I will add that LT tires certainly have more sidewall and make for more stable hauling and towing.
Now, back to the subject at hand: Since we're talking various tires, I think I'd like to pursue that subject a bit more. It occurs to me that LT tires on a half ton truck exert more force and wear on the wheel bearings, hubs and suspension in general than a P rated tire, simply due to their extra weight. Which by the way, gets quite heavy on these larger tires. So, I would venture to say that regular old P rated tires on wheel adapters are probably no more stressful to the truck than a set of LTs on an OEM rim. Thoughts?