Well I'll get in. I think RV tire's not being used is also part of the problem. Your pick-up or car in your garage or drive way gets used everyday, or couple/three times a week. The tires get heated up, cool down, heated/cooled, they get to flex and are not sitting in the same spot for 6 months or more. Now RV's, most sit most of the time, weather indoors or out. Couple trips during the summer maybe, then a thousand mile trip to Florida or Arizona and sit for 4 to 6 months. Some covered, some not. Some move during the seasons so as not to "flat spot" them, most not. And while sitting for 5 or 6 months, the air pressure drops and instead of having 80psi when parked, 5 months later the psi is 65. So RV tires are abused somewhat just by not being used.
And as SabreCanuck says, all the road debris may cause a weakening tire that blows 6 months later when you hit nothing. And the DOT's of all the states have not been able to design a bridge abutment or expansion joint to join the bridge to the existing ground does cause some teeth jarring moments.