I just bought a used Coleman Sea Pine Popup. I've figured out all of the systems (I think) except one. How the heck do you put up the awning? The awning is supported by a hollow rectangular shaped bar that runs horizontally parallel to the trailer; there are two folding legs that fit in the hollow bar at the end of the awning that are too short to hold the awning up; then there are three longer poles that fit into holes in the rectangual bar. I've tried every possible combination to erect this thing, except the right one. There are no instructions in the instruction manual, on the Coleman site, or on the internet. Can someone help?