Welcome Don to the Stovebolt!! Good luck with your truck and its wheels and tires.
But... I don't know why so many folks are against the original 2-piece wheels that our 3/4 tons came with. I like mine. This is the second 50 Chevy 3600 that I put radials on those "man killers" with no problems. I know, most car tire shops will not work on them, but almost any truck/trailer/farm tire shop will - because they are still in use. As truckernix said, and Denny, it's been discussed many times so please do a search of topics on this board. Some have found that certain years of Dodge and Ford wheels work well with ample clearance and some have used trailer wheels with 0 inset. Yokohama makes radial tires in 7.00-15 size that are narrow and tall and fit the 5.5" wide rims.......many people run radials on the split-rim/2-piece rims without any problems.
Again good luck and welcome.

:p