There are a number of BETA cars that are currently testing they would represent what you guys are calling "mule" They total 25 or so. Some are drivable some are not. They are used for different tests, the different engineering teams get a car and run their perspective tests on it. I can put up a picture, and I likely will very soon. But Just as a heads up, the front has changed allot, there is no more fake grill (nose cone). Enjoy the tidbits.