Im guessing the XO's, good all round tire, friend of mine have been using those for years. One would run his at 60 psi on his Cherokee and he could get 24mpg on a good day. thats with a 2 inch lift and 31 inch tires, and an automatic.
Many people over state the possibility of rolling over, thinking if you sneeze you will wind up upside down in a ditch.
You might look at getting a truss for the rear axle, it might help with the airflow arround it. The right ones can strenghten the axle as well.
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