HUMBOLDT, Kan. — The Summit USMTS National Championship presented by RacinDirt hauled around the Humboldt Speedway Friday and Dereck Ramirez left ‘The Hummer’ as champion of the 16th annual USMTS Summer Fling. Hosting the 59th USMTS main event at the Humboldt, Kan., bullring, a couple early-race yellow...