At the suggestion of a fellow Stovebolt member, I was thinking of looking for a panel (like 60-66, I guess) in addition to an older van for a possible work vehicle (I do int./ext. painting and ceramic tile installs). I was wondering what the measurements of a typical panel back opening was. Does a 4' X 8' sheet of anything fit in there? How about 3' X 5'? Anyone use one for work in the trades?