Can my neighbor operate a commercial business on residential lot?

My neighbor has an easement across my driveway to access his home. His property is zoned as residential and is 3/2 home. He runs a big tree business and parks 3-5 huge trucks there each night and drives them over the easement each day. His workers meet there every morning and has place a huge 18 wheeler trailer on the lot for storage. Is this legal? how do I address this locally?