Rich,
I have a friend whose coach was fitted with the same tires all around and he could hardly keep it "between the lines" on the highway. I do not know the reason why the steering tires are different. I would not put anything except steering tires on the front due to my friends experience. There must be a good reason for the difference. Good Luck. [Editor's note: Special steer axle tires have a tread design optimized for the different wear characteristics experienced on the steer axle versus the drive axle. Standard tread designs can tend to "cup" or experience "river erosion" on the steer axle. If the coach is not handling correctly, we would suspect front end alignment, such as the tires actually having toe-out rather than toe-in.]
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