Rotate tires on Class A YES OR NO ( why?)

I have over 90K miles on mine in 5 years, and no they have never been rotatated. I am getting ready to replace them as they are getting close to the wear bars. I doubt if I rotated them, that they would have lasted any longer. Btw I haven't used tire covers, just an occasional spray of 303 protectant, and there is no visible signs of wall cracking or deterioration on any of the tires. I have Michelin steer tires and goodyears on the duals. The steer tires were replaced very early at about 10K due to severe rivering. All has been good since.