eogel;
Use a cap with full length windows that open for access to the shelf. Added a shelf that I can roll out if I need the space for something other than racing. Shelf is at the height of the top of the bed. Will post a picture tomorrow.

Ed

Edited to add pictures. Shelf significantly increases capacity and accessibility. Shelf has garage door rollers mounted under it with garage door tracks mounted on inside of bed. Shelf can be emptied and easily removed to create space for other uses. Shelf has one sloped side for easy visibility of contents. Other side is flat for larger items.