pachyderm
Suspended
Audi did that with their R8 Le Mans Prototypes. They could swap the entire back end of the car with the transmission, differential and suspension parts in under 5 minutes.
The Automobile Club de l'Ouest (ACO), organizers of the 24 Hours of Le Mans, moved quickly to ban it because it was such a massive advantage (a gearbox change in a traditional LMP900 normally took upwards of three hours).
What a shame! That's pretty cool tech!