Every time we were to be overtaken or passed by trucks, or mad 4WDrivers, we pulled over and switched off the engine. The air-cleaner was rinsed off once in 18,000 km, and then only for interest. It is a good idea to call them on the UHF, and warn them you are looking for a spot to pull over. We often pull over on the wrong side of the road to get upwind! A blog of good outback shots from ExploreOz... www.exploroz.com/Blogs/Photos/Photo_Comp.aspx?All=1 Read this too.. rvdaily.com.au/caravanners-tying-truckies-in-knots/ P7251128 Driving #Smoky60Series on our travels #roundAustraliawithSpelio