For reference, if anyone needs to know, the Triax TSS400 MKII potentially uses a non-standard desc.xml to advertise the tuners, this causes trouble with most linux based TV servers as they can lose the tuners on a reboot. For TVH you need to pass the following arg in /etc/default:
--satip_xml "http://IP of TRiax:80/rootDescr"
this will then cause tvh to bind itself without needing to discover the server everytime. This will require a static IP for the Triax unit however.