The max width is 102". That's 8'6". Technically, you are asking for trouble. But, if you are going to do it, pull the shields off the front of the trailer and drag the front two sleds as far forward as you can without dropping the outside ski off the trailer. Kick the tails of those sleds out and drive the 3rd one on inbetween them, with the tail hanging way off the back. It will work, but I don't recommend it.
Make sure your tires are up to the task, that you have a heavy enough axle and springs and that you take a spare. I'd take another hub and bearing kit too if you are going to overload it like that!