I tend to not get involved in these types of discussion however you and I have something common. If roots reach your property systemic herbicides applied to them may be legal. I will be looking into Tordon 22k and other herbicides . I went out and hammered over my fenders to get clearance on my 69 barracuda with 73 dart BBP disks and tires touching fenders while thinking of my neighbours tree. I think I am going to invest in a drone that has night vision and can release a payload . Just some thoughts