This topic seems to get quite a bit of attention over and over so I'll add my .02. I've considered these options: stay with the 9R20 but all the excess inventory is pretty dry rotted. Find some 11R20s that are maybe a bit newer all around so I'm still "stock looking". G177s on stock rims. Or super single it with the 395s. On that note, it seems like your choice is M35A3 wheels if you can find them and they seem to be about $250 to $300 each. Eastern surplus custom made split wheels (not split rings) which I think go for about $350 each last I checked if they are even still available. Or MRAP wheels which I have seen as low as $100 plus $100 minimum for the correct adapter plates. Depending on your ultimate solution you may need o rings, tubes, tube protectors, or valve stems bits to get to the finish line. If there are any other "bolt-on" options out there, I'd love to hear it but I never did find anything different than above.
I will have to do something, at some point soon, as I have 3 very questionable tires in intermediate and rear axles and I don't really want to throw good money after bad.