Hi Tareq, I guess from the lack of response no one has gone the two largish scopes on the single mount route here. Most would opt for two separate mounts. I have tried with 2 smaller scopes but found it was really hard to get them both aligned on the same target.
The weight of 2 x 6" f4 scopes would be well within payload capacities of a EQ6 mount, my setup (NEQ6pro + 10" f4.7) is about 18kgs and gets good guiding graphs, well below 1" RMS at 1200mm FL. Sometimes you need to just try it for yourself and see. There are a few images on the net of dual systems, here is a setup with a bit of weight on top(from the net, not mine).
Rick
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