an inflatable Cadillac?

On July 9, 1990, Gary Mellis, re-enacts the activities that had recently gotten him arrested in Ocean Beach: illegally docking his inflatable Cadillac, playing his boom box without earplugs, and openly drinking soda in public. (Long Island)

https://projects.newsday.com/feature-grid/long-island/vintage-newsday/#breaking-the-law