I am running Boggers right now, and they only see the street if I am on the way to the trail. If I had to drive the K5 every day there is no way I would be running Boggers. I cannot say enough how bad they are on pavement. They are very loud, rough riding, and flat spot all the time, not to mention they get crappy traction on pavement. Like some else said, buy a cheap set of 35 BFG AT's or something and throw on the Boggers on when you are heading to the trails.
However, on the trail, I love my Boggers!!!