We had the brass metal inside rubber "high Pressure" stems on our fifth wheel from factory.
Someone, at a truck stop in Ky stepped on them or somehow bent them. They all leaked. Had to replace them all.
We used metal all stainless short high pressure stems, with matching caps that bolt through the rim, designed, for aluminum wheels to replace them. Not much way to be bent or unbolted. Another thing valve cores will sometimes loosen and high pressure metal caps with rubber seals like on our motor home will contain the pressure. We discovered that in Shawnee, Oklahoma.