I can sort of understand the 30 inch width, BUT the 30 inch length is way out of my understanding. I do not know how only 30 in length will unload a double stacked set of stairs extending to 8 feet. They would have to be tripple stacked and I have never seen that before. The 30 inch width again is understandable, but why do you only want 30 inch length? The length should be easily adjusted since the rafters will run that way anyway.