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as above check with your towbar fitters about the legality of a drop plate on your car only. unless type approved you could invalidate your insurance in the event of an accident.you use a drop plate on your towball to go down but not up.if the plate has 4 holes (some have more) two holes are used to bolt the plate to the towbar.the bottom two holes are to bolt on the ball.after all this there is a legal requirement for top of the towball height in mm.

What do I need to know?

According to European Law all light passenger vehicles registered on or after 1st August 1998 require a type approved towbar tested to Community Directive 94/20EEC. This law governs the height and dimensions of the towball to ensure a safe and level towing height of between 350mm and 420mm (ground to centre of towball).

Any vehicle requiring an approved towbar also requires an appropriately approved towball – its 'D' and 'S' values must match or exceed the towbar 'D' and 'S' values (these figures may be found on the towbar stamp or plate).

Please note: This is not retrospective and does not affect any vehicle registered before 1st August 1998.

How do I know if my towbar meets EC regulations?

Check your towbar for a label, plate or stamp - if it’s type approved you’ll find a number, e.g. E11xxxxxxx, and the details of the vehicle for which it is an approved fitment.

when i made trailers i used the drop box to drop the hitch head.