you can do a search on here and find a discussion on this. michael changed to 305's, which is the biggest you can go on your coach.
i run the stock 11r24.5 i dont have weight issues with mine, which would be the only reason for running a bigger tire if you could.
if you have weighed your coach and are within the weight on your vin plate, you should be fine with the stock tires.
a con on the bigger tires is availability if you are on the road. a michelin 305 you will not find is a common tire stocked at places. the 11r24.5 is a very common tire.
tom
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