Thanks chas@cybergolem the C130 did cross my mind fleetingly, but I was veering toward, a battered C-47 Dakota or C-46 Commando or perhaps even a C-54 Skymaster. On the modern side perhaps an old 747 - but then that's a lot of cargo!
The boxcar is much more in the spirit of a struggling cargo hauler and I think you are right in the spirit of Stingers promise hmmmm.
The C 119 and variants though is a movie star in its own right - Flight of the Phoenix, Air America etc... so I think its a real contender!