The fact is, the difference between the 65 and 70 is .6" in height. Thats why there are no issues with rubbing. The 65's thread width is actually wider then the 70 so if you only offroad once in a while you are better off with the 65s. The real or big difference is, if you get the LT rated tires. Also remember the 70 are cheaper then the 65s.
Koz