i did see something the other day that might be a viable option. Now, this just going off an eyeball measurement, and I only got a good look at these wheels one time as the truck was only on site for one day, but it does look like the wheels for an '07-'10 GM dual wheel truck might just be big enough to clear. They're 17", and the bolt pattern is the same as the older 8 lug trucks. They looked to have plenty of clearance inside.
Another option might be to look for new take offs from the '11 and newer GM trucks, which are using a 20" wheel factory to clear the 14" disk brakes on them. I have seen a few of those with steel wheels that are similar in style to the original dal wheels.
