Just traded the 2022 RAM 3500 for a 2026 3500, Question is, the 2026 comes with TPMS too install on the trailer tires. They look like they are aluminum valve stems. Don't think these are going to work with the Sailun S637 with 120 PSI
The instructions for installation that came with your sensors state "The sensors are rated to read up to 150 PSI." I doubt they would supply valves stems that could not handle that pressure. I have run 110psi in my tires with these aluminum Schrader stems without issue.
You might check out my resource here in this forum.
FWIW, IMHO - I doubt you need to run 120psi in your Sailuns but that's a topic covered ad nauseam.