I got this idea after looking at the Drifta Kitchens out of Australia. This trailer would provide sleeping for two adults and two children (4' bunks). You could modify this to be wider (5') if you want. The galley is not in the back (sorry purists), but is on heavy duty slides coming out of a tongue box in the front. The tongue box is connected to the inside of the trailer and the main lower mattress (46" wide x 78" long) slides into the cavity left by the slider kitchen. This allows for a the bunk beds in the rear. Each of those mattresses is 30" wide x 46" long. With this design, you wouldn't need an operable rear hatch. The kitchen could be made to slide out in either direction to accommodate tricky camp sites. The main body of the cabin is 4'x8' and the tongue box sticks out 18". Thoughts?