The 1964 Chevrolet C10 pickup had air-ride suspension, "which means you can lay it on the ground or jack it up to drive it", owner Todd Sutherland, of T. S. Engineering and Metal Shaping, in Alexandra, said.
Mr Sutherland said he added the suspension "for novelty value, to make it look cool and be user-friendly".
It took him "about a year of nights in my workshop" to add the suspension and do other work to the car, including re-upholstering the interior.
The car has its original paintwork, but now has a 2013 SS Commodore six-litre V8 engine.
"I love it," Mr Sutherland said.
"It’s what I wanted."
About 150 cars were on show at the Cars in the Park event.
It was organised by the Central Otago Rod and Custom Club as a fundraiser.
The club hopes to raise about $30,000 for the Dunstan Hospital Ambulance Service, which will use the money to put a stretcher lift in its ambulance.
