I (usually) check all of my tires before each trip including my spare, well it's been a while in between trips I checked it yesterday it was ten pounds low!
I prefer the high 100 psi high pressure rubber stems like the OEM stems on our 3/4 and one ton trucks. With five trucks and 8 trailer on the road I had too many problems with broken metal stems. Moved all my equipment to high pressure rubber stoped that issue. I use them on my rv trailers also.