I have used both the '13 6.7 Cummins and a '12 6.7 Powerstroke to haul a 50' rowing trailer that weighs about 8k lbs loaded. Two things make me want to buy the Ford over the Ram. You said you were looking at a 2500. It will sag a lot more than a 3500 or a 350. Right there I would shy away from...