"Bud's a classy rig and long time Piston Cup loyalist who's got a funny anecdote for every racer on the track. For just a few liters of Dinoco oil, he'll probably spill a secret or two."
According to Cars Finder, Bud is a Luckeyliner Gentleman.
Both Bud and his make (Luckeyliner) are named for Bud Luckey. Bud Luckey voiced the Jackalope from Boundin', who is featured in a mural on the back of the rig. In fact, the Cars Finder description of Bud seems to almost describe Bud Luckey himself.