Feel your pain with the neighbors... mine was noise related.
If it gets bad enough with the neighbor... recruit some CP'ers to help put up a 2 foot fence on your side of the property line.
Paint their side "Oil Country" or something.
If they wheeled things across your property... check to make sure the weight didn't make a nice groove(s) in your lawn.
I thought the city changed laws a few years back regarding impact or use of others property. So you can't mess up/damage someones lawn, you can't shoot mower grass clippings onto someone elses property... you can't let your sprinkler water someone elses lawn, etc. (which to me also includes using others property to accommodate renovations, without the property owners consent.. ie. no leaving mud, no damage to property like sunken lawn from weight, or using property to store items, tools, etc.).