rk911, I've run Michelins and Goodyears. Both performed well. Had one GY suffer rivering but all others are good. Since you're experiencing uneven wear on both sides, that indicates an alignment issue. While bad shocks will wear your tires too, usually that will result in bump on the tires that you can feel. Before you make the decision on tires, I'd invest in a alignment check. Fix the problem before you give up on any tire mfg. I'm not knocking Roberts Tire, but use caution when purchasing from them. Especially the Power Rd. shop. A lot of those tires sit in the hot Arizona sun for a long time. Insist on fresh tires.
I'd also recommend Spectrac Alignment shop, 405 E Baseline Rd, Gilbert, AZ 85233
Phone: (480) 545-5533. I've used them twice and found them to be reasonable and very knowledgeable. They are on Baseline just off Mesa Drive near La Mesa RV. Call them and explain your situation, or stop by with some pictures and get their opinion....BOL....Dennis