If the grooves and rings are clean and straight-there shouldn't be an issue with the locking rings although I do share your concerns. I've even seen folks run radials on these old rims. I just found 2 in a local yard that I'm going to clean up and put new rubber on for the rear. I was at Macungie this past weekend and one vendor had 2 6 lug 17" drop centers for $15 but I'm not even sure if these would clear our drums-I had a tape with me I should have taken a measurement. If they did fit, the next issue w 17's or 17.5's is finding tires which is why I didn't look more closely, but I thought I struck gold until I saw the tire size on the sidewalls. Another option that would be like a "super single" is the lockring style rims that were used on the Kaiser Jeep military vehicles in the 60's. These should be available through a surplus dealer somewhere as NOS, but they have a different deep offset than the single or duals of our trucks. They can only be used as singles, but I believe that they're wider than our rims. Mike