Actually there are fully rated towing systems that use Universals.
If you use a single bar and "hinge" both ends in the horizontal plane be very careful... you will no longer have horizontal stability.
If you use twin unis and the towing vehicle slows the unis will allow the disabled vehicle to skew left or right with no resistance and plow into the tow which is why an A frame principle (full or short with an extended draw) or solid point at the disabled vehicle is used for unmanned apps.
Anyway, back to universal joints in towing applications...
Here is a link to the Mchitch site.
I have both of the hitches, the vertical drop on pin style and the horizontal pin auto coupler.
The Auto coupler is a twist on the truck style ringfeeder and is absolutely the best hitch I have ever used, on road or off.
My off road van is two tonnes and I travel alone and using it is a breeze... much, much better than a Treg
They do A.S rated universal joint couplers to 6 ton
http://www.mchitch.com.au/
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