This looks dangerous, but I suppose having stacking cots could save room inside a cramped tent. The Two Person Portable Camping Bunk Bed has “sturdy steel construction bars” and a sleeping surface, made of heavy-duty, washable, mildew-resistant 600D polyester, that’s wider than most camping cots. It says it sleeps two adults, with a weight limit of 230 pounds for the upper bunk and 250 pounds for the lower bunk. It folds down to fit in a carrying bag for use while camping, but they can be used as extra sleeping space for guests at home, too. The Two Person Portable Camping Bunk Bed is $165.49 at Amazon.