I'm in the process of purchasing a new Dock plate at our plant, but with a slight problem. The biggest lift that we have is an Allis Chalmers F100242PS. I don't know haow much it weighs and I'm sure the company wants to pay as little as possible. There hasn't been a maintenance guy in this building for about 10 years, so do you think I could find a manual on this lift? Of course not. I'm guessing it is about 5 tons?? I'd rather have a dock plate much greater than needed rather than not enough. But I need a ball figure to start from. Any Help?? Any info would be great.