Hello Pete,
I'd just would like to let your users know of a problem that I experienced when filling the tire on my 2009 Chrysler Grand Caravan that has tire pressure monitoring valve stems. The valve stem is made of cheap metal. It snapped while I was filling the tire with air, hence all the air came out. Don't bother going to a non dealer to fix it, they'd just tell you to go to the dealer or they'd have to order the part. Also tell the Chrysler dealer you want enough air in the tire so the pressure monitoring device shows the correct pressure , this seemed to escape my dealer.