I have an airstream with a rear bedroom. I loved that our last outing the bedroom overlooked a creek. We like having the nice view from the bedroom and feel it is more private than the front bedroom. I could be wrong though. I also could see, depending on how the site is laid out, having the entry steps in the rear could mean you walk in on grass or sand because the concrete pad or gravel pad may have ended at the front to middle of the trailer.
Still, lots of folks have front bedrooms and love them. I would think most 5th wheels have that arrangement and it would be a similar feel.