Not a problem...
Here's the space before the bed went in...
Looking from the front of the trailer you can see the space, to the right, that I was working with.
These are the cross braces under the bed. I did use the original "facing" of the bed onto the hallway as the vertical support.
You've seen it before, but this is the bed platform with the piano hinge (extension out) and the supports under it. There are three supports attached to the bed "face" that support the extension.
Not the best picture but I hope you can see the supports folded back into place.
Okay, this shows the mattresses stacked as they would be when I'm in transit. Or, if I just want more room to move around. If I just want a "daybed" I can have one mattress horizontal and one vertical (behind it up against the wall) with the platform folded up.
This is the bed made up for sleeping with just the mattress pad on. (BTW, the plastic on the mattresses in the previous pic is from when the were just delivered...)
I hope that helps. Let me know if I can help clarify anything for you.