What can I do to get this auto dismantler to stop. He dismantles all day and night. trucks drop down like a bomb from the winch 3am?

Call your town and complain.

Call or go to City Hall,  The city is divided up into "residential, & industrial zones, and rural.   If your house is located on industrial land, then he is probably allowed to run 24/7 and there is nothing you can do about it.

.   That is like complaining because the trains make noise when you live beside the tracks.(or near an airport for planes)

. City hall will tell you what the dismantler is allowed to do.   Obviously he did not want to drop that piece, but accidents do happen.  This is a city hall matter and they have their business police on his door step pretty quick.

call the city/town hall where you live if he doesn't have a license to operate they'll close him down, if he does they'll remind him the hours he has to abide by

assemble a 12-foot privacy fence around property line......