I might be the only person who didn't realize this until now, but in case it's helpful to anyone else, I just read that the LATCH system in cars apparently maxes out at 65 lbs TOTAL weight (child and car seat combined). My 5 year old is going to be in our Britax Marathon for as long as she can fit it, but it occurred to me after reading the post someone shared on my Facebook that we're almost at the limit for having her seat LATCHed (the Marathon is 20 lbs, and she's 44). So we'll be securing it via seat belt this weekend. Some more info here: https://csftl.org/whats-the-deal-with-weight-limits/ and tons around the Internet. I'm really surprised I didn't know this before, so glad I read it when I did.