Malcolm is posting this from his iPad since he left his laptop at work today. After he got back to the trailer after work, he installed the new tire pressure monitor system on the truck and trailer. Everything was up and running great before dark.
After putting all the tools away, Malcolm decided to query the Internet and find out what settings would be best for pressure and temperature alarms. One thing that he found repeatedly is that people recommend using metal valve stems with the sensors, as the centrifugal force of the sensor will eventually cause the rubber stems to split. Malcolm is still upset with himself on not insisting the Goodyear place put metal stems on the trailer tires (the truck has them).
Now it is decision time just three days before we leave – take the pressure sensors back off, or somehow get the tires to our tire store to have the stems swapped out. Malcolm will call the local tire shop and ask them about doing the stem swap. He may just jack the trailer up on the spot and take one tire at a time over. The alternative is to see if they will do it in their lot early Saturday morning on our way out of town.
Traveling Talleys 
My tire dealer uses metal stems on all high prerssure tires and does not charge extra for them. I have heard that the rubber stems should never be used at over 45 lbs from a number of dealers and truckers over the years. I am not an expert on this subject but I would insist on metal for my 5ver and truck
The truck already has full metal stems. The Goodyear place that put the G614s on a couple months ago put on “high pressure” stems (rated to 120, according to my local dealer) that are part rubber and part copper/metal. Their biggest concern was the fact that our trailer rims have the stem set down into a hole, making it potentially difficult to screw the nut and washer down on the outside portion of the stem. The Goodyear place didn’t act like they wanted to even attempt anything but the combination rubber/metal high pressure stems that they put in. Matter of fact, they had a strict policy they wouldn’t put more than 95 PSI in any tire, despite the tire, rim and stem ratings.