On Saturday, June 28, 2014 5:40:05 AM UTC-5, Frank Thompson wrote:
Any suggestions on how to line up new 4X8 plywood on bed of small (4X8) trailer so that new holes do not need be drilled in frame. I want to use original holes. Original fasteners are 1.5 inch selftapping sheet metal screws.. If needed I'll use next larger diameter screws.

Use the original plywood as a template and pre-drill holes...