Do You think this is legit ?

I'm selling my truck in the classifieds. A guy e-mailed me from UK and said he is a "seller" who buys and sells goods of all kinds. He wants to buy my truck, has his own shipper to pick it up and a business partner who will issue me a cashiers check. It way be legit but it seems like I remember someone posting about being ripped off by something like this.