Ofer,
What Per Johan showed you is the right direction to go. The site below shows many examples of similar setups.
http://www.ronsrail.com/gallery.html
The Ronsrail is currently out of stock, and Ron doesn't know when it will be available again, but you can get the idea. The Wimberley is really meant for still photography, and will not work well mounting only using the lens tripod collar, or just mounting the camera as a single point attachment. I use a common plate to tie my XL H1 and Nikon 80-400mm lens together, and my only weak point is the junk 501 head I'm currently using. I'm looking at a Vision 3, which I have had my rig on before, and with the proper spring, it's more than enough, as long as the camera and lens is balanced properly on the head.