Thanks to everyone here. My opinion is slightly different.
I have so much distrust in the tire changing industry I finally decided NO one but me will work on my tires. I bought a tire changing machine and balancer. After countless years of morons and finger pointing at everyone at the tire shops but themselves I had enough.
If I need help I at the very least have a torque wrench in hand at all times.
I got the tireman stems. HIGHLY recommend thanks to everyone here. Wouldn't be without. pressure checks were nearly 30minutes now down to 2-5 minutes. And yes extenders are trash.
My next big purchase will be a TPMS monitor. I kinda think if you want to stretch your time out this is the only scientific way to know when something bad might happen. Reading countless threads the rotting starts inside not outside of the tire.
I believe at this point (im still working age) I put 5-6k miles per year. I've been running cheap tires. Trazano, now Pathfinder (discount tire). My thoughts are dump them 3-4 years and get new ones. I buy direct and install myself so all in im at about 600-700$ Basically I can change anytime I want and can reset the timer 2-3 times before buying one set of spendy michelins.
Longer trips and out of country trips 10-12k/year I would certainly consider michelins. I'm really interested in steel sidewalls which few tires have.
If its light use (which most rv's are) I don't see a big problem with cheaper tires. I do try not to buy real knockoffs like Chinese tires. I think the pathfinders are kuhmo's, Mastercrafts coopers etc.
If your fulltiming or doing big trips months at a time i'd consider the michelins. (check costco) they deal michelins.
But be very vigilant about the age. and don't except ANY new tires 1-2 years old before they see a rim. I'm averaging 5-6 months old. (this is tough sometimes and accepted for passenger cars, but not rv's and make it my mission upon tire shopping to get a date code before I buy anything.)
8-9 year old tires with the weight an rv carries can cost 10-20k$ in damage from just one blowout!
I've seen the light on tires here and you will too if you read enough threads.
There is centuries of knowledge here that have been through it all! I have listened an have had not one issue yet thanks to the good folks here at RV.net!
I tell anyone that listens about how serious tires really are. I still don't get the number one safety item on a car is dealt with by someone getting paid 10$ an hour. There should be a safety certification program and higher wages to go along with them. Maybe then I'd go back to a tire shop.