A lot of the Terri Troopers would class saveterri1 as a Class 0 troll. "Harv" could be a well intended, Eeyore like, gloomy yet loyal person. But he talks about things we can't verify and that look pretty fishy in that light.
When I wrote that, I was mostly thinking of the one who suddenly popped up on this thread.
They could be plants from somewhere else, or just individuals acting alone. I really don't know.
Some sleeper trolls might be in place to troll specific issues. Others might just wait until they see a lot of Freepers become emotionally involved with an issue, then surface to troll for the opposite point of view.