The condition of the ring and the channel are the unique considerations to these type of rims. Channel should be clean and the edge reasonably square. The rings must not be "sprung" or distorted. That is to say, when fitted back onto the rim, they should spring back flat into the channel. On top of that are the regular considerations: cracks, weld repairs, elongated mounting holes, excessive rust....any of these are a reason for condemnation of the rim.
When I was in Kandahar, the tire guys were fixing a very large (about 6 feet in diameter by about 3 feet in width) heavy equipment tire. They had it laying on the ground, with one guy holding the air hose and filling the tire. Three other guys were all leaning over the tire (ring facing up) and one guy was hammering on it, trying to get the ring back in to the groove, as it was part way out. I put a stop to their work and had them deflate the tire, which they did after putting a very large set of forklift forks over the ring.
I will always feel like I saved three to four lives that day.
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