Hi John, Very sad to see your remark. If you had called with this issue when it happened I could of told you to close vents and windows. Unfortunately this is a lesson to all about driving on unsealed roads. I must add that I did get this Motorhome checked by the manufactures after this complaint and it came back A+. The people that hired this before and after haven't had a issue ether. I'm also very sad that your holiday and experience with traveling in NZ wasn't a happy one. Hope you travels in the future go better for you.