My MYLR will be arriving on 4/30 and I am trying to figure out our booster seat situation. We currently have two Chicco KidFit 2-in-1s in my Audi Q5 and in my husband's M3P. They are next to impossible to buckle in the M3P, for both adults and my 6 year old twins. I really want them to be able to buckle themselves. What do you have in your MY that is easy for them to get in and out of on their own?