14.6m trailers - what’s the point?

Old John:
Does any trailer longer than 13.6 m not have to have a steering rear axle?
I thought they did, and if so, they will be easier to drive than a standard trailer.
(Never driven one, just asking)

Do a lot of work with 15.65 LST trailer and I was told in transport that its illegal to use without the rear axle steering. I find they pull and handle near enough the same as a normal 45’ one. Just don’t try and park in a tight spot in the services or you may not get out without removing someone’s cab (mega tail swing)