If you have a truck or SUV with a gear ratio you feel is too high, or you just wish to improve towing performance handling, braking and acceleration, you can easily and inexpensively alter the effective gear ratio with lower profile, high performance tires. I run 275-60-15 sport truck tires, rather than the stock 31x10.5x15 mud and snow LT tires in the Summer on my SUV. These tires dramatically improve my towing experience. From an acceleration perspective, it's like going from 3.55 gears to 4.10s. The lower profile and stickier rubber compound gives vastly better braking and handling too. I mounted them on a set of OEM alloy rims that I got on craigslist for $75. I swap to LT tires on the original rims in the non-boating months.
As you can see below, the tires look a little odd, but they sure work well.
