The other day i got to try out my truck to see if it would pull my 5th wheel trailer, which is a 24ft flatbed which weighs 5000 lbs and i had my 84 ford f-250 4x4 with a 6. 9 diesel which weighs 6300 lbs on the trailer. On the edge of algona there is a fairly long and steep hill and the old dodge climbed right up it no problem, i held the boost to 36psi by controlling the fuel with my right foot and the pyrometer hit 950* which i thought was kind of good for the mods i have. Time to add more fuel to the Beast!!!Oo.