"Official" EQ6 max load is 25kg - this means 15kg in real world.
So.. you will need a bit bigger mount for that 12".
Or alternatively, you may try to reduce the weight, by repacking optics into truss frame for example.
I will be mounting my 10" newt (OTA is poliester fiberglasss) on EQ-6, but it is only 13kg - so another 2kg for the rest of the equipment will OK.
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