I recently acquired a Sharpstar SS 140PH APO refractor, I was concerned that this was too big for the AM5, I know it is too big for my AVX, the CGX-L is overkill for everything short of a RC16. But i would really like to use this with the AM5, i've purchased the counterweight bar and plan to weight down the center of the tripod and thoughts.
I've seen pictures of the new FF130 APO on the AM5 w/o counterweight and i believe it is heavier 12.5 Kg vs 11.7 Kg