Cart Mart, a San Marcos-based golf cart dealer and distributor, has grown to $12 million in annual revenues. The company recently signed a deal to become the primary dealer for Club Car golf carts in the lucrative Coachella Valley market. Cart Mart expects to increase its staff from 60 to 75 employees to support the new dealership, which CEO Brian Rott believes will triple their current business. While Cart Mart sells golf carts to courses, most of its sales come from modified carts used in planned communities, businesses, universities, and military bases throughout Southern California.