The Prince of Plungers.

Gonzo's plumbing truck is a battered panel truck driven by Gonzo in The Muppet Movie. A Hardware Gonzo decorates the roof, and a hand-lettered sign announces the presence of "The Great Gonzo, Plumbing Artiste: Prince of Plungers." Following a collision with Fozzie's Studebaker, Gonzo and Camilla join Kermit and Fozzie on their adventure to Hollywood. Eventually Kermit and the gang trade in the truck and Fozzie's studebaker for a bigger car.