I've been talking about building a setup like this for years, but the width is always an issue for tractors and I didn't have any axles laying around, so I've never done it. With a forklift, you might could get away with it form a width perspective. Make the frame of the trailer narrower than the legs on the torsion axle. Make 2 pivot collars of some sort (bearing, bushing, etc) that line up with the trailer frame, shown by the green circles below. Fab up 2 torque arms (red rectangles) that are 90 degrees to the torsion axle and allow you to pivot it. Install 2 hydraulic cylinders (blue arrows) that go from the trailer frame to the torque arms. The hydraulic action will allow you to raise and lower the trailer by manipulating the angle of the axle, and the hitch or trailer jack will keep the front end up, allowing the back to tilt down to ground level.
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