A blow out in a motor coach or on a travel trailer can be traumatic. When you have a catastrophic tire failure in a Class A motor coach, it's not just a matter of getting out your jack and spare.
The ruined tire normally is the least of your problems. Keeping a Class A motor coach under control with a blow out is not only dangerous, the tire while coming apart can do significant damage to your coach.
When motor coach tires loose pressure they can do a lot of damage before you can safely stop. First the tire will literally start tearing apart at the seems. Then, these tire fragments that may weigh 20 or more pounds will start beating your coach like a whip before they come off of the tire casing. The cost of tire damage to the coach can reach many thousands of dollars.
So, how can you insure you are doing everything possible to minimize your risk of a blow out?
The most important thing you can do is inspect your tires for damage, insure they are properly inflated, and they are not over age.
Most tire damage is obvious. Missing chunks, splits, etc. But Sometimes when you hit a pot hole or debris in the road the inner wall of the tire is damaged and the only thing preventing a blow out is the outer skin. That's what happened here, the egg shape bump on the tire is caused by air being pushed through the internal split in the tire and being held in by only the outer skin. This tire will blow out and soon. A tire with damage like this needs to be replaced immediately.
Another common mistake RVers make is not replacing tires that are too old. They may look fine. In most cases you won't wear out an RV tire by the time you need to replace them. RV tires are made very similarly to over-the-road (OTR) truck tires. They're meant to be driven upwards of 100,000 miles. While truckers will easily wear out multiple sets of tires, the average RVer may never wear a tire out. That doesn't mean you don't need to replace them. Tires, over time, are affected by the sun's UV rays and these rays will dry out a tire causing "dry rot." For example, Goodyear's warranty against Sidewall Weathering is 4 years from the date of purchase.
But, they recommend replacing them if side wall cracks exceed 2/32". Here is an example of a dry rotted tire.