I am looking to take a westbound trip on the CZ next June from CHI to EMY and will be using 20K AGR points for a 2-zone roomette. I know from researching that I'll want to sit on the upper level on the right side, and I see from Superliner sleeping car layouts that the roomettes are laid out in each car with even numbers on one side and odd numbers on the other (http://www.craigmashburn.com/images/amtrak-diagram-superliner-sleeper.jpg). I called AGR to see if they knew which side would be on the right so that I can make sure and book an upper level roomette on the correct side, but the woman said they never know which side will be which until the trip is about to start. Does anyone have past experience booking roomettes on this journey that can offer advice on whether odds or evens are usually on the right? Also, in order to make sure I have enough time to book my desired room, how far in advance should I book for a June 2015 trip? Thank you!