 On January 12, 2015, JR Motorsports announced that Custer would drive a truck for them in ten races in 2015.On June 13, Custer won the Truck race at Gateway Motorsports Park, holding off the No.23 truck of Spencer Gallagher, after the dominating trucks of Erik Jones and Matt Crafton were involved in two wrecks at laps 142 and 152.