Good info, and now that I think about it - it does seem like it would not be fair to allow that. It would in a sense be "cutting in line" because somebody else got out. And I agree, thats not fair to anybody who is waiting!!
As far as the differences I was curious about - I guess I was looking for more of a spec changes - for example:
1- flat sides vs round
2 - flat door
3 - better performing fridge (due to larger door)
4 - tilt out windows vs sliders.
Those I am aware of - but other changes I'd like to know about too. It could kind of help between a decision of ordering a 2017 vs trying to find (needle in a haystack) 2014-2016 pre-owned model.
Thanks for all your help - its much appreciated!!