I was just looking through my Micro Mark catalog and they have a new product on the inside back cover. Part #83538. It is called a "Topside creeper". www.micromark.com I don't know how to post a link so you'll have to go to the web site and put in the part number to see a picture of it. It is 1/2 step ladder with a long base like an engine stand with locking castors. It looks like it will support a person and allow them to reach about 5-6 feet to the back of a layout. It has a pad at the top like a mechanics brake stool so that you can lean your chest on it to extend your reach without having to go into contortions.