Porbably a silly one, as usual.. Does it matter what sort of towball i get? i wanna tow a boat and a normal box trailer, what size? how much should i pay, i already got the bar, not the ball
The ADR states that the ball has to be rated to 3500kg and be of a one piece solid steel contruction so it kind of limits your options. There are a lot of different manufacturers of towballs, so just get one that is rated correctly. It should be a 50mm, there aren't mant trailers with the 1 7/8" hitch anymore. Expect to pay between $10-$15 for one.
i got a pack at supercheap for around 15 dollars, it includes a the ball, the rubber guard and the ball cover, it was packaged in the supercheap brand but i believe it was made by ark, its got all the approvals and rated at 3500kg
