We purchased our 21 BHS in November 2015. It came with Vail 205 75 14 tires. After 2 trips all 4 tires have cracks in the tread. I didn't see the cracks between the "ribs" of the tread. From the side the tire looks fine. Another camper happened to look at the tires with the sun shinning on them at just the right angle. I am replacing all 4 with a brand that gave good service on our previous camper. I am thankful for the camper's warning and hope this information keeps others from having a really bad day.