These trucks have such few number of circuits, it seems like the easiest way to wire them would be one circuit at a time using spools of wire cut as needed.

I can understand using ready-made circuits for cars like Cadillacs with all kinds of power extras but on an ad truck with seven or eight circuits it doesn't seem necessary to go the ready-made route

1950 Chevrolet 3100 (Ol' Roy)

1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)