Have you considered an EQ-8 tripod?
http://www.sirius-optics.com.au/moun...er-tripod.html
There's also the Rainbow Astro OWL-160N with 150 kg capacity, but unfortunately it has a price tag to match the high capacity!
http://www.rainbowastro.com/new/them...ntent/acce.php
It says it accepts Tak EM-400 mounts.
Local price is extreme at over $2k:
https://www.siderealtrading.com.au/p...tripods/piers/