Utility trailer question- how to make it work?

These trailers are typically used for moving lawn mowers, quads, golf carts, etc.. Hence the long ramp.

Shorter is more maneuverable, yes, but that is why it's harder to back up. It is much more sensitive to your steering efforts.

Frankly, I don't see why you can't just fold the tailgate forward and let the panel hang off. If it's something fragile like 1/4" paneling or drywall, then buy a few 2x4's to support it.