Although Workhorse did buy the original Chevy P32 chassis design, Workhorse developed the "W" chassis that was NEVER Chevy. Many of the components on the "W" series chassis are not in Chevy's parts manuals. IE, dash, brakes, front axle, steering components, etc. Some Chevy truck shops will deal with Workhorse chassis and some will not. You may never have a problem getting service or parts on a "W" chassis. But some items will be an issue. There are a couple of web sites that will help you deal with Workhorse issues.
http://www.stepvanparts.com/workhorse_chassis_p1.htmhttp://www.oemys-performance.com/ Richard