would recommend making their live hell like starting the day at 5 am with sounds of horns etc
do u have morning shift if so tell them to make as much noise as possible, ****** dont like morning sunshine.
The problem with doing that is that it might cause more issues than it solves. Obviously you get a few unsavoury characters from travelling families. Besides asking them reasonably to leave, there's not a lot you can do. Bloody disgusting the police won't get involved.