I run a EQ6pro ('09 vintage), rated i think at 21 or 22kgs My OTA rings and dovetail alone is 19kgs, the W.O. Megrez 90 is another 4 odd kgs plus all the cameras and the like the imaging rig itself is closing in on 30kgs thats not including my 12 and 15kg counterweights either! Im not running a huge focal length but at 1200mm it is still sensitive enough to vibrations and the like. My stars are round at 15-20 min subs so it can be done!
Key to making these things work is adjustments, get as much of the backlash as you can out of the system, align the worm/and gear perfectly and your fine.
My kit is happy with wind upto about 5km/h and ill tell you now my scope is a parachute!
Brendan