Apprecaite comments, a mate has one, with no issues, the only thing I am wary of is the towball lock visibility, to me its a simple clip, compared to a raised handle and visible pin in the unlocked position with the Alko, ie possible to drive off with to towball coupling not seated properly.

Have seen a differnt 3.5t version which I prefer similair to the ALKO, with the hand brake handle at 45deg. to the unit and the ratchet for the H.Brake a series of serrations on top of the body of the unit.

I want the 50mm ball so am not changing the ball if I want to use my boat or box trrailer.

https://www.caravanrvcamping.com.au/product/ark-off-road-coupling-3-5t-with-ratchet-brake