tire sizing questions for a truck

[Hersbird]

Except look at the price and selection of the 75 vs the 70. The 70 costs less by quite a bit and has LRR choices where I don't see any for the 75 (although I only looked at discounttiredirect.com where I buy all my tires.) A larger section width to gain height hurts aero both with the width and the height, then it costs even more on top of that. If you want a high load ability look at 195/75/14's which are what all the mail trucks are running built on the S10 chassis.