We have 8 of them on 16's holding up 9600's.  The one set was among the first in the US so it is something like 7 or 8 years old now, and the combine is a pretty extreme application.  No problems so far.  

You can stand on the sidewall of one of the tires if the machine is parked in a ditch or something transfering a lot of weight to one of the duals.