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I wouldn't be using a truss tube for imaging, IMO you would have too much flexure for imaging, as for a 12 inch solid tube like the gso offering, I found the tube to be not rigid enough for long exposure imaging, I could consistently get 5-7 minute images on a G 11, I ended up selling the 12 inch tube as it didnt meet my expectations.
For simplicity I went back to a refractor, so I could do deeper images, whilst I would like a 6 inch or bigger the budget only went to a 5 inch apo. I have yet to go past it's capabilities, am currently looking at a better camera myself as the scope can get better resolution than the camera delivers ( using an OSC with 7.8 micron pixels)
There are plenty of scopes that will work really well on a g11 so you have lots to choose from.
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