Reading mny posts on UQs and I remain confused. I used my long warm fiberfill coat as an underquilt on our last campout. It worked pretty well but will not stuff very small and it really didn't get below 35. Bob used an underquilt that he made from a thrift store duvet. It worked for him as well but it has cotten outing so will not be good for the AT. We both had to be pretty well dressed as we slept and it would be nice to find something a bit warmer.
Problem. We currently have ENOs but are thinking that we will be wanting to get something else for our AT hike and trial hikes to prepare. Are UQs designed for particular hammocks or if we choose a good UQ will it work on any hammock we get?

We both sleep cold -in a Hammock anyway. Should we plan on full UQs despite the extra weight since part of our hiking will be in freezing and below freezing conditions? If we send them back during the summer months, will we regret it when we are atop of a mountain in August?