There are two large silver poplar trees in my neighbor's yard close to our property boundary. A privacy fence separates our yards and is adjacent to the trees. I have a love hate relationship with the trees. They are beautiful and provide great shade to my yard but as I'm sure you know the suckers and surface roots are a nightmare. I frequently trim the suckers and sometimes cut/chop the problematic surface roots in my lawn, taking care not to inflict too much damage because I don't want to kill the trees. There are several very large protruding surface roots that have sought haven underneath the fence line. Over time, these roots have pushed up above ground enough to start causing problems for the fence. One post has been pushed over several degrees and as a result the fence is starting to bow out a little. It looks like the previous home owner had attempted to cut back this root in the past and even installed a 8ft long bracing 2X3 along the bottom of the fence. I am wondering how likely irreversible tree damage would be if I fully cut/remove the problematic roots out from underneath the fence. In total it would be about 4-5 roots spread between two trees that are around 6-8 inches in diameter. Additionally, could you provide any suggestions for dealing with the suckers and surface roots from these pesky trees?