I purchased a 3-pt carry-all from northern tool a month or so ago. It has worked great for transporting bags of seed and fertilizer from storage shed to fields. Don't have any tie downs on it yet. Deck is 3/4" plywood. I was thinking about screwing 2/2's to undersurface of the perimeter of the deck and back, then attaching lengths of chain around perimeter of 2/2's with short lags at ends and middle. That would provide fair flexibility for attaching bungees, ratchet straps, etc. Any other thoughts??