Over the past 3 years I have loaded/unloaded the following ...
E-type Jaguar
Chinese Formula A1 car
Ferrari F3000
Rolls Royce two-door
Subaru Imprezza
David Coulthard's F1 car
a Bugatti 'shell' on wheels (almost complete car, no engine, no steering wheel)
A Dodge Viper (I think) for the Gumball 3000 Rally
Ferrari F430
A Maserati 'thing'
Lotus Esprit
These were mostly on A.330s and B.747s, althought the Bugatti was on a A.340-600.
These were all 'one-offs', just a single car on a passenger flight, in the below-deck hold.
To be honest, they're both 'interesting' and 'a pain' to handle. All the above had to be placed nose-in, then turned through 90 degrees. This means undoing all the strapping, moving the car and then re-doing the strapping. I think that it took 20 people to turn the Rolls Royce
.