We meet again colin,
I agree that it would be helpful for all caravanners to have a single point contact to obtain information about the various aspects of towing and the law etc.
There is a real difficulty in allowing unverified contributors such as you and I, adding advice to such a service, as there is the potential for such advice to be incomplete, misleading or at worst wrong and dangerous.
The Site owner (Haymarket) has an obligation to ensure that information published and supplied, as being authoritative, should of course be correct, otherwise they are open to legal challenges. It is my opinion that if Haymarket were to offer such advice, they would need a full time person who was responsible for verifying and collating all the information - not a likely outcome, as there is no obvious line of revenue from such a service.
It would be more appropriate for the web site to offer a list of general topics and offer links to verified sites, such as Government offices NCC and other organisations. Who are regarded as the guardians of this information, and who do regularly review and publish their own guidance.