I don't know about the RS-7 system but the "Cotton Carrier" system at (www.cottoncarrier.com) works well for carrying two D700's with the 24-70 and the 70-200 Nikkors. I use the "PacSafe" steel reinforced camera straps (www.pacsafe.com) and (of course) our own Nikonians foam padded camera straps. The image shows me sporting the Cotton Carrier system.
"Great things are not done by impulse but by a series of small things brought together." Vincent Van Gogh Check out my Nikonians image gallery at http://www.tinyurl.com/f5titan