I know this thread is older than dirt....but I thought I'd chime in and mention that I have the 31x10.50x15 Cooper Discoverer H/T tires on my Tacoma.
I just bought the truck a week ago and these tires were already on it. They had about 200 miles on them when I got it, and then I put another 2100 miles on it in two days, and they were great on the highways....smooth and quiet as can be.
I doubt they'd perform all that well off-road, but they do run nice on the road.
JMTCW.