Cooper's had some recent bad press, but I don't know which series of tires. So many brands have many of their lines made in so many different places, results are likely to vary. Our first Class C used 8.75R16.5 tires and I bought Pep Boys Futura Scramblers, made by Cooper. Not one bad thing about them.
Others... Michelin name needs no introduction anywhere on the planet. Those XPS Ribs are the top of their line. Goodyear has a competitor for those a "G-something" and I forget the number.
Our present Class C came to us used with Bridgestone Duravis R250, probably the Rib version of the R500 mentioned above. Simply outstanding tires, but priced close to XPS Rib.
Firestone Transforce HT competes with LTX MS2, and most of what I hear about them is good. LTX line is a good OEM tire from a great company, but still an OEM tire.
I'm concerned about the blowouts. Have you weighed your coach, loaded as for camping? Inner rear duals lead a hard life. If all four rears are inflated the same, the crown of the road puts extra load on the inners. If we run the right outer off the edge of the pavement, right inner gets shock loaded to full weight of the right side. Less ventilation under the center, and if it's a Ford the hot tailpipe runs next to the right inner.
Our rear axle is loaded very close to max, and we have not had any tire failures. Makes me wonder if you're over. What's Year/Make/Model of your Coach? Can you provide the Wheelbase?