I did this in one of the earlier incarnations of the my trailer when my children were small; The thing I learned was that the large windows
rule out any idea of using the hull as structural support...The solution for me was to have a welding shop manufacture 1 1/2 angle iron box ends for the sides of the trailer that fit over the windows
about midway so it transmitted the weight
of the sleeper to the belly seam...then when needed the cross pieces were put into place and the cut 3/4 ply strips would drop in...it worked for 15 years...now the boys are 30 ish and 6'7" with boys of their own so I have removed it...Its present incarnation is the permanent large bed most go with...Although it now has hot water and a shower...Funny how you get older and roughing it has a whole new meaning? The windows
being dissected was the price to be paid for the bunk...I would do it again for the memories that were made with my young family then but I do not know if you would, to many spartan is offensive, but at least you know it can be done.
A strong heads up here is this, condensation in the upper bunk is a big problem...to control this I made a solar
silver cover cap for the trailer...sort of a second skin, then I open the fly in the upper pop top so humidity can exit and condense out side the trailer under the tarps surface, this puts a warm air buffer between the outer tarp and the underneath fiberglass hull, doing this I could control the condensation issue into the 20s in temperatures and the windows were the only thing that got wet.
I am looking to purchase a 1974 Compact Jr. Does anyone know if it is possible to add a bunk to the area over the table/bed section? I am trying to see if I can make it accommodate two people with less "cozy" situation.