Im thinking of up sizing to the 2008-2010 F450 from a f350 c/c duelly in order to carry a 12 ft camper that dry weight is 3800 lbs.Im not sure about the 6.4 lt as ive got the 6.0 and not really impressed with turbo,injector issues that ive had.So im asking everyone that has the 450 and or the 6.4 to tell me what issues they ve had.My 6.0 is a june 04 build date so i dont think its the dreaded 2003...............Thanks ...Paul