My Q7 Astro is mounted on a Losmandy GM 8. I recently posted an image of my rig in the Cats and Casses forum here on cloudy nights. An 11lb and 7 lb counterweight are used to counterbalance the OTA. Two 7 lb weights could be used, but they would be placed at the very end if the dec axis.
The scope is quite stable for visual use. A sharp tap on the diagonal at high magnification results In a vibration lasting one second or less, depending on the tube orientation and eyepiece load. I’m not a astrophotographer, however it is my guess that a more robust mount would be desired for imaging.
When I ordered my scope from Questar, I told Jim R. about my mounting plans. I shipped my Losmandy dovetail and my University Optics finder shoe to New Hope so they could attach them to the instrument. My Q 7 arrived ready to use on the Losmandy.
I’ve been very happy with my scope and mounting solution. Although the mount is on a permanent pier, it is light enough to remove and transport to a darker sky site. I keep the scope in its case when not in use.