You may not always be able to arrange a trailer with a lift on the construction site. In this case, you will need a skilled operator to unload the bulldozer from the trailer. It is very important on the ground. You can load the bulldozer directly from a height so that it is flat on the trailer. If there is no height, it would be a good option to try to create a hill from the ground with a bulldozer at trailer level on the construction site.