Frankly, those "no dumping" signs make me chuckle. They imply it would be OK to dump stuff anywhere else. Anyone who is enough of an a-hole to dump stuff in the woods is certainly not going to respect a sign.
And stuff is dumped just about everywhere, you would need a LOT of cameras. I saw a whole living room's worth of furniture right dumped at the side of a major road near Vineland a few days ago and have seen the same right on route 50.
I wish something could be done, but just don't know what it would be.