Jay Leno tests comedian Jeff Dunham’s 750-hp rat rod Humvee, a wild Duramax-powered military build transformed into a massive SEMA showstopper.

This guy’s Rat Road design is as retro as it gets, an eccentric model that would make a stunning showpiece, in the words of its builder. For now, it only comes in a LEGO version, but who knows?

The ventriloquist bought the one-off derivative of the rugged military vehicle in the summer of 2025, and took fellow comedian Jay Leno for a spin in it ...