It was a truck not a van.
They said they were investigating, but not "as a crime". Just investigating.
It was "Jesse James" (Internet pseudonym). He lived in his truck. He either fell asleep with a candle or a joint burning, set his mattress on fire inside his truck, and burned himself to death. That's the simplest explanation.
Why isn't the case closed? He had deliberately destroyed all his ID. No one really knows what his real name was. There are no dental records on file. Skipping out on a debt or criminal charges elsewhere, who knows? But until they find out who he really was in his previous life, they can't prove that the body was him, just a "John Doe". So the case stays open. Not because "the real killer is still on the loose", OJ Rogoz.