Have my sights on a new 5th dry weight = 11775 GVRW 15500 dry hitch weight 2480. 90% answers says a 350 will do it, I think its marginal. I think an f-450 CC,fx4, pick-up bed, PSD w/ 4:30 rear will do it + give me a better fuel milage. I can't complete all the different calculations that are available to come to a conclusion because I can't find a vehicle weight. I'm sure some of may have an answer, rather than an opinion. GVWR of f-450 = 16,000

A Ford fleet department can look it up in their Source Book, or take a F450 on a test drive and weigh it at a truck stop.