jimcutler I use my AM5 with my edge 11, 2600mm, filter wheel, reducer, oag, EAF, air plus, and all the cabling. Works great with 10lb counterweight. I've used also with hyperstar configuration on the same scope. Both guide very well, never had any problems and is right at the weight capacity.
I think the demand for AM7 will be low if its created. The scopes at > 50lbs are a whole different class and cost.