looking at the picture you posted and googling, I'm not sure you have an A&E awning, you have a Carefree of Colorado - google Rafter VI awning. Unless the center "rafter" you have is an aftermarket support.
My A&E have no center support and the end supports don't look anything like in your picture.
Here is what my A&E Elite awning looks like. You can see the lever at the end.
You can see there is no center support
My end supports slide in a locking track, if yours are frozen and look like mine, some lobe will surely free it up.