Don’t walk, just run as fast as you can from this.
Just write him back and tell him you will fly out tomorrow and see the truck, pay him and you will drive it back home. You can bet your life savings you will never hear from him again !!
I actually declined before I had solid confirmation that it was a scam. Otherwise It might have been fun.
I did the exact same thing two years ago. The seller claimed to be a woman who got the truck in a divorce settlement. I said that I would fly to wherever she was, give her a check, and drive home. I never heard from her again. I wound up buying a nice 2005 F-150 4WD off of Craigslist from a guy 30 miles away. He met me at my mechanic’s shop, we had lunch across the street while my mechanic inspected it, got the thumbs up, then went to the bank for a cashier’s check. I love the truck, and all ended well.