The issue I have with the ramp is the width. I'm looking at the trifold and I believe it's 3 sections of 15 inches each, giving a total width of 45 inches. I'd like to have around 60 inches, so I'd have to buy two.
I was thinking of using 1 inch aluminum square tubing with 1 inch foam sandwiched between 1/4 inch plywood. The price for the tubing is $70, enough to do two 6 ft x 2.5 ft sections.
I also decided to make the platform height adjustable. I played around with some 8020 this morning and mounted it vertically to the bulkhead. I had some 1.5 inch aluminum square tubing so I used that for the horizontal platform support.
I attached the square tubing to the 8020 with a rivnut in the tubing to tighten it to the angle bracket.