[megatrek]

unfortunately, I'm 99% certain the hubs are not interchangable You need the wider axle so the inner dually wheel, when flipped in, won't rub the leaf spring.

Just to add to what he said there is also a width difference in rear dually axles between a cab & chassis truck and a regular pickup dually. The C&C being appx 6" closer on the wheel mounting space (the inside dual will rub horribly and the outside will sit in the middle of the big dually fenders). A standard dually PU bed will not fit on a truck that was originally a C&C truck without wheel spacers or swapping rear axles. I have not confirmed but I believe the wms of a C&C is very close to that of a regular 3/4 ton or SRW 1 ton rear axle.