[RayChez1]

Tires after five years start getting some small cracks on the side walls called weather checking or ozone checking. If the cracks go deep, it is time to change the tires. A blow out will do a lot of damage to the wheel well and it could also cause an accident. Not worth taking a chance in my opinion. These cracks are also caused because of the lack of driving the coach. IF you use the coach often and exercise the tires, they will go a lot longer without getting the checking.

Now as to the size of tires your coach should have? I am not sure, but on my 38' coach their is a sticker right next to where the VIN number is located which tells you what size of tire your coach had out of the factory. A 42' coach usually has a tag axle for the extra weight, but I know that some Gulf Stream coaches have been built with a single axle and I do agree that the tires might be a little on the small size, but I am not sure.