In this case fear comes from lack of understanding, and there is a lot of fear about them out there. Find the right person(s) and this will be a no problem exercise. Cleaning the rims and rings, especially the groove the ring sits in, and repainting will help re-seating the ring and increase the safety. Just be careful not to spring or bend the rings when you take the tires off, get the tire bead down low enough toward the center of the rim so that the ring's flange that goes under the tire bead can clear the bead as you work the ring off the rim. Actually these are quite safe when done right, but the chain wrap or in a cage during inflation for assurance is highly recommended. Foxtrk2 has good advice to offer about watching the tire bead come up over the ring flange, tapping the ring with a hammer to keep it seated while gradually adding air until the tire bead comes up over the ring flange (with safety chain in place). Once the tire bead has come up over this flange the ring cannot come off. Some shops, including mine, have a machine that removes and installs the tires on these kind of wheels up to 24". We do it for our 5 tons, deuces, and M715 and M37 with our machine. Saves all of the sweat of the hammer method which I did for too many years before I got the machine from GL!