i've got an 09 -6.4 350 super duty,bought in October 2011,with 54500,km thats aout 32000 for you guys . I've put 20,000 KM on it towing a 36 ft fifth wheel 2400 kms with tool boxes ,
use it now for work tool box and 125 gal fuel tank,no problems so far.
got most of the bells and whistles
norm