@DOR55, it is a Primo UT6x12. I bought a tri-fold ramp and drilled out the hinge rivets. I was using an insert with a few inches of drop, then recently I installed the F150 reverse leveling shackles which lower the rear of the truck, so got another insert with less drop.
I made up pins out of 1/4x20 SS bolts that drop into holes in the OEM tailgate. I also drilled holes to put down two ramps for low golf carts.
For long trips it gets belts and suspenders! Third picture is the rear tiedown plate with Nylon cutting board milled to give a wider area for the rear tire to sit on. I had the chock type Erickson plates in front and behind the front tires, and the Spyder had a hard time backing out of them, so I switched to short plates behind the tires. Fourth picture is under the trailer showing how things are bolted down to the deck.
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