I have a 2013 rockwood 8319ss and I'm wanting to install the jt strong arm stabilizer jacks. I've located the frame on the front where I will install the from four stabilizers but can't seem to find the frame that runs perpendicular to the trailer itself in the rear end. If it was a steel frame I could use a magnet but it's an aluminum frame. Also, the whole underside is insulated so I'd rather not start cutting into it. Has anyone figured out how to find the frame or does anyone have an 8319 and know where the frame is? Any help is appreciated. Thanks in advance.