Joel, thank you for the link.
Even though the cost of replacing a set of tires on a coach or tow car can be fairly high, it is cheaper than repairing the damage that a blown tire can and often does do to the coach or tow car.
There is also the safety concern (that is hard to overstate) and the cost and inconvenience of having to change a blown tire on the road. And believe me when I say that if you do not take care of your tires, a blow-out is in your future.
Gerald