This week, GM stablemate Cadillac looks back at its own colourful history of yacht-sized droptops, with the unveiling of the Cadillac Ciel at the Pebble Beach Concours d'Elegance.
Fit for presidential cavalcades and mob bosses, the giant Ciel (pronounced see-ell) is a four-seater four-door convertible sitting on independent suspension and equally enormous 22-inch alloy wheels.
Despite appearances, the Ciel is "only" 300mm longer than the Cadillac CTS sedan - but that extra 30 centimetres puts it smack-bang in Holden Caprice territory.
Power is provided by a twin-turbo version of GM's 3.6 litre SIDI V6 petrol engine, developing an LS3-rivalling 317kW and 583Nm of torque.
This engine was revealed back in 2009, but in this case, the petrol engine is mated to a hybrid system using lithium-ion batteries - although numbers for this system weren't offered.
Among the Ciel concept's features in the cabin are Italian Olive milled wood inserts, pull-out blankets, aromatherapy controls in the armrests and a drawer dedicated to sun screen, sunglasses and a beach towel.
The Ciel was designed at GM's North Hollywood Design Centre, led by design boss Frank Saucedo, exterior design Niki Smart and interior designer Gael Buzyn.