Hi Just read your post .
You may want to do what I did in my Trillium and remove the front top bed and make a top hinged drop shelf that sits level with the lower bed surface. I bolted this with strap hinge to the top of wall of the lower front section and used 1/2" plywood for a bed extender. Shelf is about 13" x 44" long ,goes from the fridge
to the door. I drilled 3 -3/4" dia holes in the outer edge of the shelf away from the hinge side and made up 3 support posts of wood with 3/4" dowels glued in the top end. These just go in the shelf holes from the bottom and stand on the floor. Note : I used masking tape to make the dowels a snug fit.
I have made a cushion to fit with velcro strips sewn on the bottom and the other half of these stapled to the shelf so they line up. This prevents the cushion from moving when sleeping. The setup gives a 45" wide bed with the space forward of the stove for your feet. no tools are required to set up the shelf, and the cushion is the backrest for seating.
I use throw cushions to fill in the sides of the backrest when sitting as it is only 44" long.
You just remove the posts and cushion and drop the shelf down against the wall of the lower section to convert to seating again.
The only problems are:
1. You can't open the fridge
with the bed made.
2.The space to exit the door is about 10" wide with the shelf in the up position.
3. You may have to play footsies with your bed mate.
On the plus side you have 2 45" wide beds and no climbing to get in to bed. Works for me !