F650 as 5th wheel tow vehicle.
I'm currently towing my KZ Montego Bay Sportster with a 14K dry weight and close to 20K fully loaded with a 1999 F550 7.3 with 4.88 rear end. I'll start by saying I love this truck. In most all situat...
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You maybe reluctant to modify but I invite you to visit a local powerstroke diesel shop and let them explain what they can do. I had a stock 6.0L and with just intake, exhaust and custom tune it was a whole different engine (plus bulletproofing). My 6.0L on the safe "street" tune would pull as strong if not stronger) than the new Ford 6.7l (F250) AND I got better mpg. I towed with it for 20k before letting it go (at 250k miles).
