May not want to swap tire sizes on that Ram just yet..

It irks me, because I want my gauges to be as accurate as possible. Changing tire size is one of the most common upgrades people do to a truck. Cars and trucks have been built well over a hundred years and there's always been a way of correcting the speedo, whether it was a speedo pinion or easy computer change. Why stop it now? I understand manufacturers not wanting huge tires on trucks because of the additional stress on parts, but changing to a factory size tire?