Moving into Triple at De Neve - Questions

Im moving into De Neve with my best friend (unknown building, unknown third roommate) I’m gunning for the bottom bunk but theres obviously no guarantee I’ll get it. My biggest concern is being able to sit up in the top bunk? They look so close to the ceiling. Can you sit up in them? I’m about 5’3" if that makes any difference. Also, are they secure enough to hold more than one person?

I’ve been reading around and it seems that the top bunk without the desk underneath is the least popular choice. Understandable. Anyone have any experience trading with their roommates? Like once every quarter you switch beds? I feel like it seems like a good idea at first but once you get settled in I feel like no one would actually want to move.