I had a 2011 LTV Libero and the first thing I did... before delivery... was to have my dealer (who isn't into gouging his customers) arrange for metal valve extensions to be installed (replaced all 6). I got mine from the well known "Tire Man" in California who had designed them and sold them from his tire dealership. But he has since retired. There must be other sources since this needs to be done on all of these duallies it seems... I never understood why it wasn't automatic from GM, MB or Ford.
You will love your Unity. I recommend attending one of their rallies up in Winkler. (if we ever get to have rallies again) :(