Ben beat me to it. I was going to say, I can see these things being the hot ticket at Nascar event parking lots.
The only worry I would have is, some of the fans in a fist fight over what car your cooler cruiser is painted to look like. I would also guess that there would be some big boys testing the weight limits of these things. 300 watts probably isn’t going to push 400lbs all that well.
A cool gizmo non the less.