To try to avoid confusion I'm keeping the pictures on different posts My other crane is smaller and made from 4" I beams. Its set up to work with the two post lift, but not attached to it. On this one, the supports are outside the lift so I needed 2 crossbeams. One is in front of the lift and the other is behind it. Because of the pallet racking and some other existing shop items I did it this way. When we build the one in my sons pole barn we will use his lift as the main support and mount the I beams inside the lift posts. Then only one cross trolley will be needed. Its hard to get a good picture of these lifts that shows them well.