Interesting that you say they hit before they got over the studs; for me they only get close when they are over the studs. Until that point the drums aren't close to the drop-center of the wheel where they would interfere. Mess around with it a little and see what you come up with.
No matter how much cleanup I did, none of my wheels worked. I have a few buddies looking for wheels for me and one of them came up with a set of 6 16.5's with very good tread tires off of a Chevy motorhome. I measured these and they were over 14" between the welds! I already had 2 16.5's that did not measure near this wide and would not work so these wheels really surprised me. They fit tight but cleared and fit with no problems! These tires are a little old but are not bad and will work for now and I also have 2 other sets of 4 16.5 tires so I am going to look for some more of these wheels. I believe the Accuride # is 27995 but I will have verify that as I forgot to wright it down or take a pic. Not many 16.5 tires made today but they are still making them so I should be covered for a while. I am still going to look for the later 17" dually wheels but it is no longer a priority.
