Well, my mom is planning to visit for 6 months and we only applied for regular TRV. In my invitation letter, i said that we are aware of supervisa but since she is not planning to stay for up to 2 years, we are applying for a regular. The real reason is that my mom's passport expires in 1 year so I don't see any value in applying for super visa and going through medicals as she will have to go home anyway. Once she gets her new passport, we might consider super visa.