Does anyone know what brand/model tire Ford used on 2004 F-150 XLT SuperCab 4x4's equipped w/ P235/75R17 tires? TireRack says it was Hankook Dynapro AT RF08's. Can anyone confirm this? Also, will the speedometer be effected much if I change from the P235/75R17's to a LT255/70R17 size tire?