I just watched a video showing how to set up factory TPMS for trailer on GM trucks. It says you can program (in the truck) tire pressures between 50 psi - 100 psi. My 5th wheel tires require 110 psi...
I don’t know if they are the same system but on my 2009 we raced the truck and ran tire pressure as low as 20psi, I had the dealer reset the tire pressure settings in the TPMS so we wouldn’t get the dashboard warning.