astra estate towing mirrors

tarquin

just bought a 2012 vauxhall astra estate,have tried all the usual mirrors (thanks for your patience robinsons !)but cannot get any to stop on due to the design of the wing mirror.obviously designed by a non caravaner.toying with buying some of the suction
 design to fit on the glass.would welcome any feedback from anyone using these already.cheers tarquin