Hi, I'm going to Orlando in a few weeks (woo hoo!!!) staying in Disney so not hiring a car but planning on using uber to go to universal etc. I have a trunki boostapak thing for my 9 year old, i was hoping to use uber family to get a high back car seat for my small 7 year old but I am not sure if it is just the seats with a 5 point harness for toddlers that they provide, anyone used this for a child of a similar age? Thanks