Neighbor of Rental House is driving through my yard

[Randall Vanfossen]

Hello All, I have a situation that is perplexing me a little and wanted to get some other opinions.  I have a rental property in neighborhood of cookie cutter houses, all the same 3/2/1 1104 sq ft and all side by side.  I have a good relationship with the neighbor across the street and he let me know that the people in the house next to my rental have been driving through my yard to park their truck in their yard.  Apparently its been going on for a while and has put some ruts in my yard, not deep mud pits but it's obvious that the grass is being driven on.  

I called the sheriff, they referred me to the magistrate.  I called the magistrate and they said if I wanted to bring a civil suit I could do that or call the sheriff.  The helpful neighbor has already talked with the sheriff about them.  He also called the Department of Environmental Protection because these folks have trash and debris all over their lot, he said the DEP is making them clean it up.  

I'm thinking about getting large landscape stones to create a barrier.  Does anyone have any other ideas?