My design is a cross between the 2+2 and the Campster from the design library. I also got inspiration from Doug's trolley top designs and Steve's Rondack Lodge.
I designed this trailer for my family of 4. I have 2 young children, but I wanted the bunks to be large enough to sleep a full size adult if needed. There will be a pull-out potty located in the cabinet between the bunks and the full size bed. I decided to make the full size bed permanent and not make up into a dinette. I will have drawers under the bed for storage. Along with the drop floor there will also be a storage compartment under the front bottom bunk for a spare tire and a few other items that are not often used. The design is not complete, but it is a good starting point. I am open to all suggestions and improvements, so let me know what you think.
Here is the free trailer frame:
And here is my design:
Dan
. Have fun with the build!
. I guess it all makes for sharpening the skills for a build though, right? 

For your upper folding bunk, what about strong hinges on the back wall and decent-sized slide bolts (along the both the back and on the ends on the sides of the tear) that bolt into the wall studs when it is in use. Then, to be extra safe, maybe add a couple strong chains on each end on the 'in' side that hook to eye bolts or other type of receiver in the ceiling? Does that make sense? Would that work?
