Reactions from other drivers are usually friendly, but not always.
"People are mostly stunned," King said. "Some people are terrified and give the sign of the cross. Others give me thumbs up."
Rivera was once accosted by an irate bystander who thought he was being disrespectful to the dearly departed.
"I stopped at a 7-Eleven to buy a Slurpee and a woman started screaming at me. She thought I stopped on the way to a funeral."
Rivera and King met through one of several clubs for hearse owners. The Phantom Coaches Hearse Club, which boasts more than 100 members, meets a few times a year, usually in cemeteries.
People need only one thing to join, "just the appreciation of these fine cars," said Jeff Perrin of Long Beach, who calls himself the group's chairman of the morgue. "We have people from all walks of life. We have lawyers, actors. We all seem to get along."
Perrin speaks about the matter with a certain amount of authority. He used to be a mortician. But instead of attracting customers, his choice of vehicle seemed to scare them away.
"My boss made me park it down the street," he said.
There are pluses and minuses to owning a hearse. They get horrendous gas mileage, but one can be fairly certain they were never taken for a joyride.
"They're usually well-maintained," Perrin said. "They don't want them breaking down in the middle of a service. They don't have a lot of mileage. And they weren't driven too fast."
But there's always the part about dead people being passengers, an idea that Rivera and King seem to relish. Rivera's has the license DED CADI. King's is GOTH SUV.
And there are certain perks involved. Free admission to haunted houses is virtually guaranteed. And Rivera once gave "The Exorcist" star Linda Blair a ride during a parade. In the weeks before Halloween, they are busier than a one-armed gravedigger. They even ride in a Christmas parade on the Palos Verdes Peninsula.