I never pick the trucker named Longhorn as the truck stats seem crappy compared to the rest, but this time I did just to see if it was any harder using him. It wasn't really any harder, I made it through the arcade mode. When I went to start another game I saw there was a new truck!
Nippon Maru

I never knew that there were even any additional trucks to unlock in the game! It was kind of cool to discover a secret I never knew about in a game I've played so much over the years. I looked it up afterwards and all you have to do to unlock him is finish arcade mode as each trucker one time. Since I never pick Longhorn I never unlocked him until now.
It was almost like I was back in 2001 for a brief second when I saw that truck appear. With the internet pretty much any secret in a game is spoiled very quickly. Yet I somehow never knew about this for 20+ years. I see you can also play as Lizard Tail by beating arcade mode with each driver on very hard difficulty. Too bad I saw that. I would have been even more surprised if I had done that without knowing.