I just drove from Dallas Texas to Portland Oregon pulling a trailer and with the back of the truck loaded, enuff to squat the truck just enuff to make my lights hit the eyes of oncoming vehicles. I crossed over several mountain ranges, and my 00' 5.4 SCAB climbed those mountains like nothing. I was passing cars and trucks alike. OK, so I'm gonna have to replace the rotors now (from coming down the mountains), but I was thoroughly impressed with my truck.