Charles,
I've had several shoots this year with the Red Cam on an EFP with a Blue spring arm. With the lower bridge plate removed (mounting a focus motor from the top of the camera), clip on matte box, Red cam battery and flash cards the camera weight was in the low 20# range. Maybe gets up to 25#s or so with the hard drive mounted. First time out I used the Red Cam monitor on my rig (which was fine for a dark interior), but I've since picked up a Red Byte Decimator for better monitor/transmitter options. I can send you a link to many pictures of my first, minimal set up if you'd like.