Hey Capt,
Not birdvet, but I have maybe some suggestions for you. When I ship birds I condition them several weeks beforehand with extra vitamins and electrolytes. I also get them used to the shipping container during this time. I leave them in the shipping container for hours and then eventually overnight with the same conditions they'll encounter during the shipping process.
The day of, in their shipping container they get whatever their favorite food is. For me it's usually millet since I have the smaller birds. Plus they get apple and oranges in their container for moisture. I've shipped birds from San Diego to Maine with no problems - to the airport 3p.m. PST, picked up in Maine about 7 a.m. EST so that's about 13 hours in transit being banged around. Here's an article that's similar to what I do:
http://www.plannedparrothood.com/shipping/shipping.htmlI've also RV'd for two weeks at a time with my birds. I suppose the pets are just naturally not going to be so stressed. But for RVing I'll give the birds fruit smoothies to make sure they get extra liquids and energy.
You might want to check to see if anyone's a bit on the thin side and start fattening them up a tad bit. Some will do better covered for most of the trip, and some will prefer being able to see. Some will do better with their mate, some won't. I don't know about amazons, but the eclectus for the most part need to be in separate carriers or they hurt each other. Same with a pair of goffins I used to have - one pair traveled well together, one pair had to be separated or the male would hurt the female.
Apologies if I'm telling you stuff you already know. Good luck on your move!