Vehicle operational diagnostics and trailer health status system combination

A combination comprising:

• a powered tow unit providing a first vehicle frame;
• a cargo transport unit providing a second vehicle frame and configured to be mechanically coupled, electrically coupled and pneumatically coupled to said powered tow unit;
• a first system controller supported by said first vehicle frame and in electrical interaction with the powered towing unit, said first system controller providing at least first control electronics confined by a first housing;
• a second system controller supported by said second vehicle frame of said cargo transport unit, said second system controller providing at least a second control electronics confined by a second housing, said second system controller configured to communicate with said first system controller;
• and
• a cargo transport unit health status system supported by said cargo transport unit and configured to communicate with said second system controller, and interacts with said first system controller when said powered tow unit is mechanically, electrically, and pneumatically coupled to said cargo transport unit.