Neighbor Says He Can Legally Cut Our Trees Down.

We have 30 acres with a dirt road attached down the entire side that neighbors in the back of our land have a legal easement to drive down to access their house. Think of a rectangle with a dirt road attached to one of the long sides and their land is at the very back. He needs to move a mobile home past our 30 acres to the very back but the trees on our land that are along the dirt road are blocking him from moving it. He says that he has the right to cut our trees down the line of our land that are all against the dirt road since he has a legal easement to it. How could this even be possible? He is wanting to cut down 10-15 mature trees probably around 40-50 years old. Is this true that he can do this just because he shares the dirt road?