Utility vans carry parts, tools and equipment to a job site for a contractor like an electrician or plumber, all while keeping everything out of the elements. The enclosed body of a utility van may even offer enough headroom to stand while working.
A truck with a service body is a mobile workshop. The truck can carry equipment, tools, and parts needed for jobs, like: electrical, plumbing, and general construction. Service bodies have storage for tools and parts and come in various body lengths.