And now for todays updates ...... the supports between the upright posts are not anchored just yet. It looked too naked without them.
Should I have upright posts on every support?
I ran out of narrow channel from Menards - just picked it up. Each support is a 1/2" wide channel and a 3/8" wide channel together.
I measured the bunk supports today - 9-1/8" overall - translates to 11' overall - I guess I'm building an off hiway trailer rather than a on-road style......