I've seen the Mamiya TLRs but never held one. I had no idea they weighed 6 pounds, presumably without the lens, or is that with the 80mm? Either way, that makes them even more different animals from Rolleis and Yashicas than I thought.
That is the weight with the 80mm lens. The 80 mm lens alone weighs 12 ounces. the 180 mm lens with shade is close to 2 pounds. The 180 plus shade extends 5 inches from the camera body. A formidable piece of equipment.
A rock pile ceases to be a rock pile the moment a single man contemplates it, bearing within him the image of a cathedral.