The Hayman Reese 600 lb Weight Distribution kit is by far the most popular Weight Distribution towing aid in Australia. This kit suits trailers that have a ball weight between 135 kg and 275 kg. Available in classic or standard kits, our 600 lb Weight Distribution system can accommodate various sized A-frames and coupling positions. Classic or Standard _ which one? Both classic and standard Weight Distribution kits improve safety, handling, control and comfort when towing. However, each kit has been specifically engineered for your individual needs. Classic kits are best suited to trailers, camper trailers and caravans that have a 4Ó high A-frame, or 5Ó and 6Ó high A-frames where the coupling is positioned at the bottom of the A-frame. Standard kits are better suited to trailers, camper trailers and caravans that require more clearance around the base of the A-frame. Perfect for 5Ó or 6Ó high A-frames with the coupling positioned in the middle or top of the A-Frame.