Parts & Service Departments

Welcome to the future.  But our future is built on a strong past.  Our parts department proudly offers the only fully stocked and comprehensive heavy duty truck parts inventory between Denver, Colorado and Amarillo Texas.  You can bet your brake shoes we’re proud of that!  With over $2,000,000.00  and 20,000 parts that cover 2 cycle Detroit Diesel engines to the latest Cummins ISX engines, we’re extremely proud of our state of the art parts department.

We continually invest in our business by offering our customers paperless billing, online purchase and historical data at their fingertips, outside sales and delivery services and the friendliest staff that strives to give you the most professional and honest solutions to your heavy duty parts needs.

Have you ever heard of “Gladitude”?  Probably not, that’s because we’re the only ones that offer it. We’re glad to see you and it shows in our attitude.  We sincerely appreciate your business and we realize you have many choices of parts and service destinations.  We’re so glad you made us yours. 🙂

Meet Trevor La Cost-Partner/Parts Manager

Trevor LaCost3

Trevor has worked alongside Gene La Cost for the last 30 years in the heavy duty parts industry.  His wife and three children help further his passions for his community.  These include the ARTS and more specifically instrumental music, music preservation-history-collections, design, building preservation and restoration and golf.  Trevor has been a longtime volunteer in Prowers County for over twenty-five years and believes wholeheartedly in giving back to his community.  Trevor is currently serving on ten boards of directors including Southeast Health Group, AVWPE, Inc., Southeast Colorado Arts Council and others that follow his passions.

Meet Chris Duffy-Partner/Service Manager

Chris is a Lamar native and has been with Arkansas Valley Diesel Service, Inc. for ten years now. Chris is actively involved in volunteerism in Prowers County and he’s been a longtime volunteer with the area volunteer fire departments. Chris is also a proud member of Southeast Colorado Diversity Council. Chris is usually working on motorcycles or cars in his spare time and also enjoys woodworking and metal art. His interests included old cars, old buildings and architecture and historical preservation. Chris and Amanda welcomed Gunner to their family in May 2015 and he continues to be the joy of their lives.

Meet Kevin Appel-Technician


Meet Travis Lucero/Partsman


Originally from Crowley County, Colorado, Travis is a U.S. Air Force Veteran that served during Desert Storm and he has worked over 20 years in the hospitality and property management fields. He now calls Prowers County home with his five children.