Hi - I'm going crazy trying to find the perfect convertible seat for my almost 1 year old. Hoping someone can help! Mostly, I want the seat to be very easy to install with a seatbelt. . .and easy to adjust the harness securely. I would also like to keep her RF as long as possible (she was 27.5 in and 15b 3oz at 9 mo's). I loved the Britax ClickTight models until I went to the store and almost fell over trying to pick it up - we will be transferring the seat between me and my husbands car on the weekends and traveling a bit so 30 lbs is a little too heavy!! Any ideas?