We just booked a trip to AZ in early October.

We will be traveling with a 2.5 year old and a 6m old. I'm getting a headache thinking about what to pack. We plan to rent a car there because we want to go to kid friendly places around AZ.

For those who have flown to places where you'd rent a car, what did you bring?

Should I bring car seats for both kids? Should I put the toddler in a car seat on the plane?
Would it be better to rent a car with car seats?

I'm pretty certain I want to take our double stroller with us. We just recently bought a Maclaren Triumph double stroller. We are going to have so much luggage - two car seats, double stroller, diaper bag, suitcases.