OH, the good ole' tire debate... Almost as entertaining as the MPG debate.
Everyone treats their TIRES differently.. Never mind inflation, speed, weight but also outside temps, skidding tires during braking, etc. In my opinion the biggest damage you can do to any tire is the tight U-turn/skidding that you see evidence of at any gas station. I have no clue if an ST tire can handle the side force better than an LT tire and quite honestly do not care. Also not saying that every blow out is due to one factor.
What I will say is that the next time you strap onto that trailer and start cutting tight corners (forward or backwards), take note of how twisted the tires look like in the middle of that corner and think to yourself "I wonder how much hidden damage I'm doing to that tire right now".
just for fun I'd like to state that my truck gets better MPG than your truck too. LOL