That would be a neat trailer in RC! I have operated one just like it years ago. The geometry would be tough in a small scale
. There are hyd jacks with small pads under each corner at the end of the main bed, and then the folding section.
We used to load the bigger stuff first and then put something lighter, like a skid steer on the neck. It was power by a small kholer and didn't seem to have any trouble lifting, but it was not fast...
Jim