As of now you can rent a Trikke Skki in Züschen (Germany). 

Züschen is a little village next to Winterberg with great Trikke Skki slopes.   You can find the Trikke Skki at the main rental next to the top parking Skiverleih Wahle.

To make reservations and for more information visit http://www.snow-world-zueschen.de/verleih/skiverleih-wahle/ for more information.