[Ivan D.]

P235/75-15 tires do NOT belong in trucks, period, not even in half-tons. One of the truck magazines actually did a test with a late-model Ford F150 with P-rated and then LT-rated tires, don't remember what exactly the test was but the LT-rated tires just pounded over the regular passenger car ones. How important it is to have the right tires should be suggested to you by the fact my car (yes, the car, not the truck) rolls on LT235/75-15 tires, and even the spare is a LT215-75/15. My car clocks the scales at about 4250lbs with no passengers or cargo, and I don't drive fast or tow heavy stuff like you... Hell, even my 245/60-15 summer tires are the 4-ply high-load type. So yeah, switch to actual truck tires, ride change will be minor, however handling will improve greatly. That, and you know the "better safe than sorry" principle and how much trouble it saves if followed.