All highway driving in that size, I'd probably go with the Toyo Open Country HT:
OPEN COUNTRY H/T | Toyo Tires
FWIW, I'm running that tire in the LT 265/75R16 load range C size. I live where we get a lot of snow in the winter, and have had no trouble at all in some deep snow. But I have 4wd too. We've had a lot of rain this spring, and they have done very well on wet roads.
They are very quiet, ride smooth, and should last a long time, based on what other people with them have said.
