Detailed dimension specs are.. right there.

Your other question is about.. bed vibes? That's not a real spec (for any truck builder). You can put a 100x4 sheet rock in any 4'+ wide bed.. best of luck to the person behind you. Don't forget the red flag (day) or light (at night).. in north america.

Only the bed length is listed there. It’s insufficient data to determine whether a full size sheet of plywood will fit.