Matt,
Since most all of the trees that you have observed are on the side of the road where the electrical/cable/phone lines are, do you think EGHA should contact Peninsula Light and ask them to preemptively look into the possibility of taking some sort of action prior to a mishap? They could do something if a tree is inside the easement..
The only other thing I can think of is to Identify which trees appear to be a hazard and have EGHA contact the owners with a letter of concern!
joel