All the answers to your questions so far sounds pretty consistent to what I've learned. I wanted to put some input about your trip.
Try wearing, sleeping with, or placing in clothes hamper some fleece items or other items mentioned for several days to a week prior to leaving (can be stored in plastic bag as suggested). This way they're scented of you.
Try to get as bonded with your babies best you can prior to trip.
If you have an experienced sugar glider owner watching them and you approve of their quality of care, then I suggest you relax and enjoy your trip. You will miss them, and they may even miss you a tiny bit, but they will get used to you when you return.
So don't worry, just make sure you left: your contact #, emergency vet #, and exotic vet # for your sitter incase of emergency. Your sitter will know what to watch for and what to do, trust and enjoy!
Best of luck to you.
Must add: We will want to see photos of your babies, we can wait till they're acclimated, but asap, ok?