detroitrice,
I am not sure if you are serious about this or not.
In any case, why not set the car on fire if you like smoke and glow? Since its going to eventually catch on fire when you put the fog machine in it?
j/k
I am not sure what kind/type of fog machine you are planning on installing in the car. The ones I have require a lot of wattage so a regular type inverter! and they also get extremely hot (atleast around the nozzle) I would strongly suggest against it. It would be ok if it was only going to be stationary show car, then you can put the fog machine outside the car and power it with AC outlet. But in your case you are talking about cruising!