Canoe Trailer PLans

I have a great 16' Boat trailer that I'd like to convert to a 4 or 6 canoe trailer.

I've searched all of my canoe sites and the web for 'plans' but haven't come up with any.

Anyone got a link to plans?
Cliff Jacobson has pretty detailed sketches in one of his books, I think it's called "Expedition Canoeing," or something like that. It's a pretty heavy duty structure, desigfned for long hauls over rough roads.