can anyone tell me why the 2002 vauxhall zafira 2litre dti has such a poor makers towing recomendation of 1050kg when the kerbweight is 1448kg. We at present tow a small 350 wisp only 850mtplm but are wanting to change to a new lunar zenith fixed bed which has a mtptlm of 1235kg ( well within the limits if we follow the 85% rule ). We have only had the vauxhall a year and do not really want to part with it as in all other respects it's a fine car plus we do not have finance in place to change both !!looks like we will have to rough it in the wisp till we are ready to change the car !! GUTTED