Spent about 9 days recently driveway camping at our DS's home near Seabeck, Wa. I was checking air pressure the day before our departure when we noticed that one of the 'high pressure' rubbber/metal hybrid valve stems would leak if it was moved/wiggled. The DS called Discount Tire in the town of Siverdale, told them of our issue and arranged service for the next day (day after Labor Day)
Took the wheels to them 2-at-a-time. After confirming that we had purchased the tires at Discount Tire, they dismounted/remounted all 4 tires with full steel stems and rebalanced - all for a whopping $12.98! (if I had stayed with the rubber/metal hybrids it would have been free) I thought that was pretty good service
They will definitely continue to get my tire business.