Re: what would you take?
If shoulder belts are available a Ride Safer Travel Vest might be a better option. It never expires so you could use it for your younger child later down the road. At only 30 lbs now, it's is unlikely that she is going to gain a ton of weight between now and then and a child that small in a backless booster makes me uncomfortable.
CPST-I and SAHM to DS