You should be able to tow easily with holding tanks full or nearly full. Actually, the travel motion will facilitate the breaking up of any solids and make the next dump much more efficient. Most campgrounds will allow passing through RVers the use of the dump station for a fee. Many truck stops (Old Flying J's) have a dump station, most charge a small fee. Some road side parks have a dump station but those are rare. Some RV dealers have a dump station also. There are apps for your smartphone that shows dump locations.
