We produce and design truck bus tpms from 2006, support truck and bus and trailer tpms and can-bus tpms and RS232 tpms, we have external and internal tpms sensor. CAN-BUS tpms support bus and truck manufacture, RS232 tpms support gps user, you can connect tpms with gps module, then check all tire data and status in platform of pc and phone .  another model support all truck bus in after market, and my tpms module will support the tire number from 1 to 22pcs or 1 to 42pcs.