Had our van serviced by Jayco in Bairnsdale (East Gippsland Vic) and asked them to check ball weight. 290kg Mmmmmmmm too much for the Navara tow bar rated to 250kg's. So did some culling and re-arranging and called in there today on our travels and got it weighed again :) 200kg's -  no charge and very obliging and helpful people to deal with.