The afore mentioned dan
Take the opportunity to consider an A-frame.
That is what i done, and for circa 300, I got a single 2" frame with platform on the top, and incorporated two legs as transom supports.
Hate to say it, but looks way more professional and about as over engineered as one can make things.
The stainless is a nice touch :-) and get dome cap bolts for it, really sets it off.