Do you know the provenance of this? I think I saw it at the Springfield German show and shine. The EV Rabbit was purchased from the State of Oregon and the trailer was made from a convertible so it had the little hatch in the back.
Roadkill did an episode with a pusher trailer, but I'm not linking it since it's neither economical or ecological. That had a small block Chevy with a supercharger blowing through a pipe into the small-block Chevy in the car. Instead of an Ultragauge they used tire smoke.