Firefighters responded to a call at the public storage facility on South Buchanan Circle just before 11 p.m. on Sunday.
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They found an RV in flames and a naked man whose clothes had been burned off.
"It did look like that," said Battalion Chief Dominic Ciotola. ""Either his clothes were burned off him or he wasn't wearing any to begin with. But, definitely you could tell he had significant burns, though."
He was taken to Buchanan Field in Concord and then flown to a nearby burn center.
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Witnesses reported hearing an explosion inside the vehicle before the fire.
The victim suffered second and third degree burns to 80 percent of his body.
There's no word yet on a cause.