Hi,
I have the exact same hitch on my Raclet Quickstop as the op and feel I can give an insight into what happened.
When these hitches get a bit older the release handle tends to stick instead of fully going to it's lowest position, if you're not aware of this then you could be lead into thinking it is securely hitched when it is not. I always find mine does this, with the handle going about halfway down and then stopping. If I then push it down there will be a large clicking sound as if the tension of the spring is being overcome and then the handle will go fully down.
I think this would be what happened in the case of the op, and it is purely un-intentional user error. Next time you go to hitch up, make sure the handle is fully down as far as it will go. By the way this does not affect the green button, as the tow hitch is fully seated on the tow ball, it just is not secured fully.
You most definatly can tow any trailer using an alko tow hitch - a 50mm towball is a 50mm towball. But you can't do it the other way around and use an alko stabiliser on a standard ball as the larger hitch head can in rare cirucmstances fowl the neck of the towball.
It really does annoy me when some 'internet' expert gets on their high horse and starts giving out wrong information to someone who needs help, and will then not backdown and admit they were wrong. The original poster now has gone and bought a towball they don't need, and could still hitch up incorrectly next time.
The most important thing to remeber when hitching up is to use the jockey wheel to raise the back of the car once hitched, you will soon discover if the trailer is not hitched securely using this method, with very little danger!
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