We need to get extra seats for the nanny to use when I go back to work soon, and she doesn't want to keep them in her car since she works for another family also. We have minimal space for storing seats, so nesting seats or very easy to store seats will be best. Also something light weight and easy to install...can a girl have it all? I have a FF 3.5 year old, and a RF nearly 1 year old. The nanny has a Lexus SUV.