What is 'the' correct kerbweight? The figure given by the manufacturer or - you will stonish - the figure on a weighbridge. Anyway, on whattowcar.com you can freely alter the weights.Whattowcar.com does not always give the correct weights for all cars. My car is heavier than the web site states.
When I went to buy a new caravan the dealer put my car details and caravan details on some program and it gave the % match. I am not sure what the program was though.
Graeme.