I don't remember when you are going but i thought of you when i was at the fort a few weeks ago (remembering this post). My DS slept on the top bunk. My DH and i were on the double bed but we have a King at home so it was a little tight so after the first night i switched to the bunk bed. I spent most nights with my feet propped up on the ladder cause my feet hung off a little. i'm like 5'7 and a half and it was comfy to an extent but for someone bigger them me it wouldn't be.
Just an FYI
Thank you very much, CSHaydt for coming back and posting your experience! That is good to know.