I have an HEQ5pro, I run a 8"Newtonian GSO and I have a short tube ED80 as a guide scope sitting side by side on the mount. I use a 1000d for imaging ans a DSI II for guiding. The mount is at its limits, but it could handle the load your asking about easliy. I had my Meade ETX125 on the mount for ages. What I have is fine at the moment for learning, as I am, but i'll be upgrading shortly. So you may want to save yourself the bother and just go straight for the EQ6.
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