 DTL stands for Diversified Truck Leasing, but they also provide the tools and expertise to get your truck back on the road when it's down. DTL offers all manner of maintenance and repair services for all trucks from one tons to semi-tractors or trailers. Their expert technicians have the skills, tools, and parts to keep your truck on the road. The resources and commitment are at DTL. Diversified Truck Leasing and a lot more. 1430 Carter Drive, Helena.