Duty cycle Ford V-10 (( update bottom post))

400,000 very hard miles on mine. Empty weight is 8500 lbs. typical loaded weight is 22k combined, sometimes up to 25k. Over half the miles are towing miles. Engine and trams is all original, except my belt tensioner pulley seized last night, and I've had to replace a few starter relays, a radiator and the alternator.