A quick inspection through any campground will probably yield a myriad of additional incorrect methods. It becomes obvious that improper blocking and leveling, over time, will indeed damage even the strongest of sidewalls. By practicing the correct blocking methods and making it a regular campsite habit, you will add many months to the life of your tires. Even our skin is not immune to the affects of the damaging ultraviolet rays of the sun. Motorhome tires are more susceptible to this type of damage since they are considered a slow wearing tire.
Truth is, many car tires simply wear out before such damage can occur.
Generally though, motorhome tires are not driven as far or as often as regular automobile tires over their lifetime. Many motorhome tires spend the majority of their time literally just sitting there absorbing the ozone and UV rays. A typical symptom of ozone or UV damage is the evidence of cracking or weather-checking around the circumference of the sidewall. Here a brief discussion of UV and ozone damage that further explains why this occurs. O zone, wee all heard the term, is simply a gas that is in the atmosphere.