That's one of the reasons I became so interested in the German Eriba trailers - they usually have the bed running lengthwise. In my two fiberglass trailers (Boler and U-Haul) the wife always claimed the forward edge of the bed since she seems to have to get up more times during the night. This forced me to the back of the bed where the curved sides of the trailer forced me to have to curl up to sleep since I'm right at 6 feet tall.
I looked at the Casitas because of their bed configuration but like the interior of my Eriba better. The bed on my Triton is about 77" x 77" so we can sleep lengthwise with plenty of room for the Standard Poodle too.