If it was my Tundra and I towed often with it, I'd run CS 5W-30 or Kirkland Syn 5W-30 as they are inexpensive choices with outstanding add packs. A slightly costlier upgrade would be either Mobil 1 0W-40 or Castrol 0w-40.
Oil preference freedom is a wonderful thing! We still have that freedom... for now.