Just wanted to show my low cost fix for an adult to be able to get safely and comfortably up and down from cab over bunk. We upgraded the sleeping area with 3" gel foam mattress topper, so it is actually comfortable to sleep in. The problem was the 12" wide straight up and down ladder with the narrow rungs that came with the RV. I made this ladder with a 5' step ladder and a piece of aluminum angle iron. Works great and its actually lighter than the stock ladder.