 PLOT: Paladin is driving a wagon with a spare wheel tied to the  side. The wheel is larger than any of those used by the wagon.  Paladin and his passenger happen across a family stranded with a  broken wheel on their wagon. That broken wagon does require the  larger wheel. The wheel is installed on the wagon, the family is  rescued, and Paladin goes on his way. Notwithstanding the  improbability of carrying the unneeded wheel, this incident has  nothing at all to do with the main storyline of the episode.