Yes indeedy, it was between my Cat and a 245 Massey Ferguson tractor. I backed into it's front counterweight saddle, full throttle, 7 mp/h, with the rear engine door, I hit that tractor so f@%^ing hard, I put 2 huge dents in my rear door, and the door squeals like a damn eagle when I check the oil every morning. I must have buggerd the hinges real bad. Mother of God. That was the hardest impact I have ever had with any skid steer, and in reverse. The farmer said I hit his tractor so hard, it rolled back a foot, this was with a loaded Loewen Welding feed mixer trailer, empty weight of these trailers is almost 6 tons. The story of how it happens was: I was scraping mud off the driveway, and to keep my neck from twisting and pulling a muscle, I used the rear view mirror. Bad idea. I was backing up (balls out naturally) and I glanced down just for a second to keep my bearings straight, next thing I knew, the tractor came around the corner, and stopped, thinking I was going to stop, he waited for me. Another bad idea. BOOM! I yell out, "What the bloody f#%$ was that!?!" I turn my head around, and the farmer is smiling at me. Jack ass. So we both apologize (I'm laughing inside though) and I put the plug back into my back up alarm and start using my head. Dumb ass.