The truck stop is a roadside restaurant.
The Richie Rich/Scooby-Doo Show
Shaggy Rogers, Scooby-Doo, and Scrappy-Doo stopped to eat at the truck stop, and Scooby accidentally spilled ketchup on the ice cream of a tough trucker called the Bandit, leading to conflict. The problem got worse when they drove away, accidentally taking his nearly-identical van instead of the Mystery Machine. (Scooby And The Bandit)