Haven't thought about that. Certainly no more than I paid for it. Passed through the area today. I'll try to look Friday, if not it'll be first of week.
I have towed with a 2017 tundra and now with a 570 lx 2011. 3500 lbs about the same tongue weight as you. My vehicle is heavy. It tows great. All day over the tundra. I like the tundra but it is hard to a beat a 200 series.
I am running the ko2 in that size on the same rim. I tow a 3500 lbs trailer. The end game is to do the exact kind of trips you are doing. The only thing I will do when it is time to replace tires is go up to 285/75.
@AnyMal check out overland experts. Their site will give locations and dates of group classes and where they are located. They will also do individual.
Speaking of Tundra's, I drove an 06 for over 400,000 miles (I know a different engine) with no engine or transmission issues. I now drive a 2017 Tundra with 180,000 miles on it, no cam tower leak or any other kind of leak. 18 months ago, in my search for another LC, I had a 2011 LX570 show up...
I love my Evo's. Tacocruiser told me if you change from factory always go stronger. They are worth the wight. All my tires are "E" rated. My personal preference. Evo's to me were worth the money and weight. Will I ever live up to their potential? No...but my one less thing to worry about.