If you suspect he's around and working for another company and you said you had a license plate #, unless its an enormous industry it wouldn't be hard to do a drive by of competitors and look for the vehicle.
You can also reach out to his suppliers, a salesman that sold him was selling his competitors and will know where he is.
If he stiffed the landlord and others, his employees probably got goosed to so someone will know.
Any of his suppliers that saw him regularily will know "personal" stuff about him, cottage, boat, hobbies. They may well have a home address.
The machinery went somewhere, and somebody moved it. Find a company that moves the type of equipment that left (its a smaller business than youd guess) and see who moved it and where.
There are companies that auction and broker machinery, check those guys and see whos been offered what. If its a small company see if any related stuff is on kijiji.
Finding him isn't that hard, getting anything out of him may be harder. Being a secured creditor only helps if there is something to recover. I have lots of experience chasing losers.