I think Linde is here like a toad from an old joke (when lion ordered the animals to split into two groups - the wise and the beautifull, the toad screamed - I cannot tear apart!)

One issue is the law.
According to my knowledge there's no strict interdiction of towing operation by the industrial trucks (specially when some of the trucks are designed for towing). Of course there are some safety issues and I do not support such application, but during more the 25 years of acticity I never heard about any accident caused by the fact that the trailer was towed by the forklift, not by a tractor.

The other issue is the marketing.
Linde officially doesn't support such praxis, but as a hydrostatic transmission manufacturer, they are pretty proud, that their transmission isn't in danger while towing.
I've personally seen the Linde salesman from Germany, who was "working" on the customer saying that he can tow the big trailers with no risk to the truck.
Concerning the Polish lawyers (and probably most of the European), they are a bit differently orientated.
And there's less of them here.