Meet the cowboys bringing bull riding and 750 tons of dirt to a city near you

For those who follow the burgeoning sport of bull riding, the stars are naturally the riders themselves — who train for years to master the art of staying atop a 1,700-pound bucking bull for a full eight seconds, while maintaining a certain control, if not graceful authority.

Then there’s Randy Spraggins, who’s charged with getting 750 tons of dirt — or 35 dump-truck loads — into New York City’s Madison Square Garden.

Spraggins,…