Thanks guys and gals.
I have a soft holdall and no smart stuff... tbh, smart stuff is not really me anyway.
I am getting quite excited now. I have been to the USA quite a lot... lived and worked in New York, New Jersey and Florida... spent 6 weeks driving across the USA, been to Disney loads of times... yet this is the trip I have always wanted to do. I just hope I get some good stuff to see. Obviously a tornado or two would be great (not an EF5 please!) but just to see some supercells up close and to get some pics would be fantastic.
Can't wait.