When you are at a site without sewer hookups, you can wait till your tanks are filled and then drive to the campground dump station. Some campgrounds have a pump out service and you just call the office and they send the "honey wagon" to pump your tank while your RV remains at your site. Since the grey tank fills faster, I purchased a tote - a blue colored tank on wheels that you fill with the waste from your grey tank. It then hooks to the trailer hitch of your tow vehicle and you simple drive the tote to the dump station.