Nice truck.
But...
Personally I think International should have never put a IDI in a truck this size, definitely not up the task of heavy hauling...
You're kidding right?
Man you've got something seriously wrong with that thing if it isn't pulling any load that thing can fit in its box. I don't hang my hat on my trucks all being nice, allot of them are worn out and ready to be rebuilt, but I've still worked em hard. My low mile '83 F250 hauled 24,000lb+ loads of hay almost every day for years before I bought it from the previous owner!
Heck, last year we hauled TWO old Camaro's on our 40ft flatbed hooked behind my moms 94 CC. Which had an engine running on 7 cylinders, overheating most of the way, plagued with low oil pressure readings, loaded with 4 grown adults, our luggage, 1,200lbs in tools, 150 gallons of extra fuel, hauling the 40 footer with two 3600lb cars, all the while dragging a trailer with 2 trailer brakes dragging all the way. Pulled through like a champ IMO. The 0 oil pressure readings and over heating bothered us a bit but she kept a cruising like a freight train all the way home after we'd figured the oil gauge wasnt reading correctly.
So don't tell me an IDI isn't up to the task of heavy hauling.