There is one other area to consider if you go with 2" gear. Notice the focuser knob in Echolight's great pics ... you may have to watch for interference with your 2" gear, particularly if you mount it close to the rear cell surface on smaller scopes.
On my C6 there was a problem with a WO SCT threaded diagonal in some orientations with the stock rubber covered knob (pulling the rubber knob off fixed that). I also have a short 2" visual back that pushes a barrel diagonal far enough back ... but I then have to remove the big threaded set screws when installing it ... I can't win .
I could trim the top off of the rubber knob and fit it on there.
Or fashion a small knurled edge wheel.
But focusing hasn't been an issue.
The little C5 is shimmy free on the 26 pound capacity tripod (conservative by photo industry standards), and 90 pound capacity ball head.
As far as being back heavy as mentioned in another post.....
For starters, the rear cell that surrounds the primary mirror seems to be where most of the weight of the C5 is.
Unlike other telescopes, the weight of the very compact C5 is very centrally located. So the combination of short length and centrally located mass, leads to a minimal moment arm.
And my Arca Swiss rail extends a bit past the Vixen dovetail that it is bolted to. Back to right about even with the back of the cell. So the back of my Arca-Swiss clamp is a bit behind the back of the Vixen dovetail.
Once balanced, the C5 is the only telescope I have that is never affected when changing out 25 ounce eyepieces. The altitude never needs be tightened... Although the ball on my ball head is aspheric, and does provide a slight amount of resistance even when the tensioner is fully loose.