There are arguments all over the board on tire age, etc. Here's the thing nobody seems to mention: Would you rather spend $3K on a new set of tires and drive without a worry or keep the old tires, have a blowout and possibly kill yourself and others and almost surely do at least the same $3K worth of damage to your RV? Sure, a new tire can blow and do just as much damage, but consider the odds. I like the thought of being at ease with my tires and spending the money - just me, but a thought. I also think a lot of folks wind up blowing their tires because they're trying to fine tune the pressure so much looking for the elusive "smooth ride". Inflate them to the max on the sidewall and drive. It's a truck, folks, not a luxury vehicle! Under-inflation causes blowouts, not over-inflation (within reason, of course). I read all of this stuff about "I weighed the RV and set the front tires to 87.8 psi and the rear to 92.3 psi" and have to chuckle. Get real, folks, your gauges aren't even that accurate!