Imagining a revenge move or two. Not doable, but imagining.
Collect garbage and clean up dog mess from living room. add this to chicken mess and the rest of the garbage. Dump all bags out into his new car. Then add the gas he wants you to put in it on top of garbage. Did he ask for a smoke or a light by any chance?
In the mean time a less harmful and less apt to cause a rage until you are gone revenge. Pop the rear seat bottom up and lay a glass soda bottle with grooves against the bottom so it will roll back and forth, then put seat back in place. The sound will drive him and his mechanics nuts until they figure it all out.
This slob is doing everything he can to make your life miserable.
Just curious, how does he make the payments on the cars? Are you completely free and clear of the new cars. I hope so.
This sounds just aweful. I am sorry. I hope you can escape sooner rather than later.