Here is the best pic I have of the rear bags. I am mounting them directly to the frame on top and the trailing arm on the bottom.. Its just a little forward of where the coil spring was. I have the air line coming up right at the "fork" of the frame. I made two mounting holes on either side of that and one hole in the trailing arm.
Actually this pic was the mock up of where I wanted the bag.
This one shows the bags installed.