Peter, We all can appreciate your desire to help folks in need, and in this "unique" situation we can see it helps, but as a "marketable" device for continued use in an industrial application is not only unsafe, but impractical. The steering characteristics of a lift truck prohibit it. In the States we have enough problems getting operators to use a lift truck in a manner for which it was "designed" like lifting and carrying a load without hurting someone or damaging property, let alone training an operator to use a lift truck as a "Tow" vehicle besides it won't fly with are favorite OSHA folks.
ASME B56.1 and OSHA 1910.178
We are not trying to "Rain on your parade" Just being honest.