Very cool catalog of what could be done with your 1951 Chevy truck. Never seen anything like this, but it looks to be 160+ pages of all sorts of special bodies including some ambulances, firetrucks, and maybe hearses.
http://www.ebay.com/itm/Chevrolet-Trucks-1951-Silver-Book-Dealer-Album-w-Hearse-Fire-Truck-Accessory-Etc-/310882739167?pt=LH_DefaultDomain_0&hash=item48620e23df
http://www.ebay.com/itm/Chevrolet-Trucks-1951-Silver-Book-Dealer-Album-w-Hearse-Fire-Truck-Accessory-Etc-/310882739167?pt=LH_DefaultDomain_0&hash=item48620e23df