I am planning on buying the CYBEX Platinum Cloud T i-Size. How can I attach this to the Nuna Triv?
In theory, it could be done if you'd be able to get your hands on the Triv Next Maxi-Cosi/Cybex car seat adapters. Try googling for those around you, or asking in a shop (or the customer service) - however, Nuna lately stopped making and distributing those as they want to, I guess, support their own brand car seats. So, if you find a Maxi-Cosi/Cybdx adaptors for Nuna Triv Next, you can attach the car seat, but if you don't (which is very possible), you won't be able to fit that car seat on the Triv Next frame.