Phil,
Most of the WW2 British trucks had fixed towing hooks, often mounted on leaf springs, the trailers having rotating, or part rotating eyes. Post war, rotating hooks were introduced, but with a latch to lock them. Care had to be taken not to have a fully rotating eye attached to an unlocked hook, as great damage can result. In recent years, some 2 wheel trailers were introduced with fixed eyes and the hook had then to be unlatched.
Hope this is of help to you.
Richard
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