Thanks for posting his latest email address. The address looked very suspicious to me. I got the text message from his son at 657-238-8202. He told me his name was Mike and he's from West Covina (California.)
I've got two more scammers who are sending me checks right now too. In the past, one overnighted a cashier's check via FedEx, so at least they are out $40. BTW, I've posted to FB marketplace and Craigslist. But the real swarm of these scammers came after posting to RVTrader.
BTW, the last one said he'd send a cashier's check, and to me it looked very official, but my bank said it was not a cashier's check. My bank also said that due to my high account balance, they would have cashed that check and then taken the money back when it didn't clear. I guess I'm a good enough customer that they're OK with me being scammed...
So my new rule is "only accept a cashier's check at the buyer's bank."