I have noticed that in some states some of the rest areas on the interstate will have dump stations. Is there some place where you can find a list of rest stops that have them? Also any truck stops ...
Yeah, some RV friendly travel centers will have them. If you happen to be going through Iowa, just about all of their rest stops do, which was super nice. In a pinch, some campgrounds will have a dump station near the front that non-campers can use, but you usually gotta pay.