loadmaster 235,
You might already know this but the 1947-1955 Chevrolet Truck Factory Assembly Manual is quite useful for all Advance-Design (1947-1955) Chevrolet Trucks and almost as useful for all New Design (1947-1955) GMC trucks. There is no dump-body-equipment information in this manual (if I am wrong, someone will correct me).
This manual (and a 47-54 GMC Shop Manual) is available from most parts vendors. If there is a GMC-equivalent reproduction Factory Assembly Manual (or a 1949 GMC Shop Manual), maybe some one will post information.
Also, the 47-55 Chevy Truck Factory Assembly Manual shows drawings for 1954/55-1st series Chevy trucks. There were many subtle and not-so-subtle changes and diffences between 47-54 Chev/GMC trucks.
Tim
