My brother-in-law, who lives in Ireland, lives in a fairly rural location. He had a lot of land and went into the warehousing business. He had a huge warehouse bulit across the road from him on some land he owned. It was filled with all sorts of things from Coca beens for Cadburies to PC's for HP(i think it was HP).
He had a similar problem with travellers but took a slightly different approach. He saw them scoping out the warehouse one evening, they were driving around it in their Gypomobile. He when inside his house, loaded up his .22, came back out and proceeded to fire shots over their heads. They, nor their brothers in crime, never came back.