I found that very interesting, esp since I saw tank retrievers working in RVN, placing crippled tanks on my boat near Hue (we could carry 3 down the Hue river & back to Danang) --- I assume the tanks were M60s ---- and the retrievers looked like regular tanks, minus the main gun, plus the boom assy. It was quite something to see one pick up a tank & trundle it up the ramp and plop it on the deck. I never saw the other machine mentioned here.