Think of the name Dartz and, if you’re up on your whale foreskin-upholstered SUVs, you’ll invariably arrive at the Prombron. But while glad to furnish Eastern European mobsters with the machine that makes the Hummer look like a beauty queen, Dartz is keen to break out of the Prombron’s mold with sleeker offerings. That’s what led to the design of the chopped-down Nagel sedan and, more recently, to the Mojo roadster. Now Dartz has followed up with another design it calls the Jo-MoJo. Funk Flex