I've been looking at the Ram 2500 gasser too and hope to buy a new truck this spring. I have read many negative thing about the Ram 2500/3500 reliability but they mostly seem to pertain to issues with the diesels.
Anyway, I work on our city police cars and found the Chargers's have to same PIA TPMS sensors too. They trigger the TPMS light if the pressure is too low or too high. I've read a forum post somewhere that guys were taking their TPMS sensors out (mainly from the rear tires) and placing them in a sealed PVC pipe with a Schrader valve and pressurizing the pipe to fool the system.