The Trikke Skki is allowed in the slopes of Zillertal Arena which consist out of the villages Zell am Ziller, Gerlos, Königsleiten and Gerlosplatte. www.zillertalarena.at
After some calls to the local tourist office we found out that the Trikke Skki is allowed on the slopes and lifts of St JOhann in Tirol, part of the Kitzbuhler Alpen. http://www.st.johann.tirol.at/