I will check those threads out thank you..I never owned any truck but a Ford, and I dont pull that much, only a 30 ft trailer(all Aluminum) weight of 2600 # empty and 4600 # full. I really want a super duty, but am cosidering a F150 with the 5.0 since I really ownly pull he trailer 2000 miles / yr, and that way I would get better gas mileage the rest of the time,. Thanks for your input