a quick internet search leads me to believe the wheels on there now are "fuel Blitz" in 20X10
most of those seem to be ET-18
some ET-12
but IF that is the case, then the 18X9 -9 wheel will still fit within the "outline" of what is on there now, being just as for from the suspension, but sticking out less
(which i think is good, considering it is a plow truck and ideally, the tires dont stick out past the blade)