As far as I know only the HK36 was used for glider towing, the derivations from it, the DV20, DA20 Katana and C1 are not suitable for such tasks. I started flying only recently the DA-20 Rotax 100 version but never heard about glider towing with such machines.
Also, if I remember correctly only the HK36 equipped with the 914 turbocharged engine was used for towing, I wouldn't bet that a 100hp Katana can lift a glider.
Just my 2 cents ..