Gary, I think the answer depends somewhat on what you feel your bus needs based on existing factors and how much you want to spend. The short answer is I do not think there is a tire that is only designated to the steer position.
I also feel that if you have a heavy front end or do not like the ride with your air pressure at 120 lbs. then you might consider the 365 70R 22.5 upgrade. This will offer a higher weight limit, lower air pressure, wider tires, deeper tread and a better overall ride, but it all comes with a price.
The Michelin 315/80 22.5 Energy is a great choice as well, great highway tire and can be placed on all 3 locations, the tag, drive and steer position. The 365's can only go on the steer and the tag position because of the width, and stud pattern. There is no way to mix and match the 365 70R 22.5 with the 315 80R 22.5 at the drive position.
So it really depends on your bus, your driving patterns and your pocketbook.



Sorry for being such a nubie!
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