Hi Mike,
I am going to direct you to a fantastic series of Walt Disney World Attraction Vehicles and Seating Guides written by my fellow Moms Panelist
Erin F for the unofficial website www.touringplans.com.
You can find the Magic Kingdom Guide by entering this address in your internet search bar:- http://blog.touringplans.com/2014/09/23/walt-disney-world-attraction-vehicles-seating-faq-part-one-magic-kingdom/
Other guides are available for Epcot, Disney's Hollywood Studios & Disney's Animal Kingdom.
The highly informative guides provide a complete run down of seating capacity per row, seating capacity per vehicle, seating surface, safety restraints, boarding procedure, height requirement and useful notes for each and every attraction at each particular theme park complete with photographs so you can visualise exactly what is being said.
Please note that the guides were written back in September/October 2014 so whilst the vast majority of information is correct, any new attractions added since that date are obviously not included. Likewise any attractions which have since closed will still be included.
The
Preschool Parent's Guide to Walt Disney World Resort might also be a useful planning tool for you.
Wishing you a magical trip filled with memories which will last a lifetime!
Emma