Observe that in the united kingdom the regulation states that trailers used about the road without having brakes can only keep a gross bodyweight of 750kg. For those wanting to haul greater masses we provide three types of braked couplings that are delta couplings, pole couplings and spring damped couplings. https://types-of-trailer-hitch-co90110.designertoblog.com/58661807/the-basic-principles-of-types-of-trailer-hitch-couplers