Unfortuneately out Ford is a 6.0; wish it was a 7.3 engine.  Our Chevy is a dually 454 gas and normally use it for pulling our stock trailer and the 3H BP.  But, it will pull the 4H LQ trailer.  Like most trucks the diesel pull the big trailer better, esepcially up the hills.  Just glad with have the dependable dually as a back-up.  It's my primary farm truck and has proved to be a great truck.  We purchased it this past year and has been a life saver since the Ford has been in and out of the shop a got bit in the past 12-18 months.  We looked for a older 7.3 Ford for a while, but it's hard to find one with lower miles and in good shape.  We are just thankful we purchased an extended warranty on the Ford.