Hey Bossman,
I ended up going with those tires (Michelin Premier LTX) on my 2012 LTD after reading an inspiring T4R LTD review for them on TireRack. I've got about 1500 miles on them and (*so far) they are they best tires I've ever had. We call it "stealth mode" . . . at 80 mph on the interstate they are silent ... we're now hearing other vehicles around us loudly that we never noticed before (The stock Dueler's we replaced were extremely loud even with 3/32 of tread left!). Plus they handle better than the Duelers, and the truck seemed to stop quicker when that deer decided to run in front of us last week!
I was really leaning towards the larger 275/55/R20 size, but due to lack of feedback from this forum (and others) regarding compatibility with the 7" rims (or lack thereof), I went the safe route and stuck with the stock tire size - Luckily Michelin decided to make a tire in this questionable size choice by Toyota (245/60). Toyota has made some other pretty significantly questionable choices on other things as well, but anyway, bottom line - it's an excellent truck, and I can pretty much guarantee you wont find a better tire for the stock LTD rims than the Premier LTX.. (IMHO after running them 1500 miles), can't speak to the longevity of the tire, but they are rated near the top online for tread life... Time will tell.