Tire pressure / dually / TC

I have a second spin on this. She bought the truck new and the tires are stock. I believe that they might run the tires at a lower pressure when it is new to help the the ride feel smoother as a selling point. Now if you are going to seriously use the truck for heavy hauling and you actually need those high pressures to carry loads, you would go and have the dealer air it up and readjust the TPMS alarms high and low points. Now I don't know about whether or not you as the user can do it, but I don't know because I didn't go through the manual. Does anyone know if it is a user adjustment or special software only the dealer has? I will touch on it when I see her again in September.