Up here, it's common for stuff to be put by the road with a sign on it saying "free". I've picked up air conditioners and a pile of aluminum roofing. I've put out couches, bar stools and tables. I've been walking back up my driveway when I heard a car stop and take off again. As a courtesy, they took the sign, too. Nothing ever lasted more than a few hours. Nobody thinks anything about someone stopped and loading stuff. If you don't want it anymore, give it to someone who does.