There is a big difference between "hitching up a bike trailer and take it with him" and allowing the guy to secure it and hopefully prevent a theft.
You wouldn't expect an arresting officer to stop you closing and locking the door of your house would you? Same principle in my opinion.
Personally, I think that it is not unreasonable that if the police wish to "take you into custody" then then assume responsibility not only for you and your safety but also the safety of any property you were carrying or were in charge of at the time.
Anyway, that's my opinion - which I am entitled to (I think I still am entitled to it, for the moment)
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