Needs to be big as the caravan is not small plus it get filled when they go to europe so being heavier than the caravan is important , BMW great but there shit on the slippery stuff thou a friend has a breatheed on 2008 530 d christ its quick , ive got the Passat PD130 its great thou no heavy enought , might be volvo again then eaither in 165 or 185 hp form .....