After building up many klunkers from his family's Cove Bike Shop in Tiburon, CA, and then helping his brother Don Koski and Mert Lawwill launch the Lawwill-Knight Pro-Cruiser in 1979, Erik Koski launched the Trailmaster on his own. Only 55 to perhaps 75 were produced over three years 1). Koski resurrected the brand in 1998 to co-produce a Titanium version with Steve Potts 2). See also: mmbhof and mombat.