digitek718,
Here is a couple of pics on how I built my bed system. After considering many different options, I finally decided to build my sleeping platforms out of 1" square tubing with 1/16" thick walls. I have the 7ft wide trailer, so it is similar in dimensions to what you are working with. I made the platforms 38" wide by 75" long. When folded down, this gives me an approx 2.5" gap between the beds. This is just enough so that I do not have a hand pinch point between the beds. They are mounted 24" from the floor to the bottom of the steel frames. This allows ample room for my largest cooler and also allow two stacked re-purposed milk crates (bought at Goodwill) to slide underneath for temporary storage. The 24" height gives enough room for the grandkids to sleep under the platforms, and still have room to move around. According to the grandkids, its sort of cave like??? Anyway, they like it. I chose the 38"x 75" platform dimensions to fit the Fold-A-Beds that we already have. The pads are approx 3" thick and fold in thirds ( 25"x36"x9"). If you search Ebay, you will find several different pads, many of them are only 24" wide. If you made the platforms approx 30" wide, you could mount them ~30" off the floor and also use them for a table. Take a look at the attached pictures and you will understand the concept. If we did not already have the Fold-A Beds, I would have made the beds narrower and mounted them higher to serve as a table.
Anyway, that is how I went about making the beds in my conversion.
Mitch