just had a quick look (it's probably the only reason I'm ever going to have to look at high-end mounts...)
http://www.losmandy.com/hgm-titan.html
Losmandy HGM Titan 100lb instrument/175lb total capacity
https://www.highpointscientific.com/...al-mount-mxred
Software Bisque Paramount MX+, 200lb equipment/payload capacity. A steal at $9000 USD!!
