I tow a boat at 4,000+ (more like 5,000 if we are camping) with surge brakes on the trailer - out of the 70,000 miles on my '06 V6 4x4 I'd guess 5000-6000 have been towing this load. Also figure in another 1500 miles with my 1600lbs open trailer (no trailer brakes, have had up it full of landscaping...