I have been given a one year old Shop Fox Heavy-duty Mobile Base that says it is rated for 700 pounds. I have put my Unisaw without the wings on it and I can hardly move it. The saw will slide inside the base before it will move. I raised it up and all the wheels turn. There are two that swivel and two that do not. I had a mobile base made for my 1000 pound band saw and it moves better than this. Has anybody used one of these that could tell me if I need to adjust something? Thanks for the help.