In 1968, Wayne began production of truck-based ambulances, using the Cotner-Bevington facilities. For 1968, the "Sentinel" (based on the Chevrolet Suburban) was introduced, expanding to the "Vanguard" (based on the Chevrolet Van) in 1971, and "Medicruiser" (based on Dodge Ram Van) in 1973. The Sentinel received a headroom increase for 1971, but were only built through the 1972 model year. After that, the Sentinel brand name was used on Wayne's line of Type I (pickup chassis) modular ambulances. Body shells were produced at the Richmond, Indiana bus plant for Care-O-Van ambulance units, based upon cutaway chassis and Wayne Busette body.