All ActivityMost RecentMost LikesSolutionsRe: emptying toilet tank with professional serviceCalled the United Site Services and they quoted $75 for 50 gallon and $125 for over 50 gallon. Not sure what size my RV's black tank is. My RV is a 1979 Dodge Sportsman Class C 22 feet.Re: emptying toilet tank with professional serviceThank you so much! I will call those companies and find out.emptying toilet tank with professional serviceHi, I have an old class C camper I got from a friend. It was towed into my backyard because it can't move. I started to fix it and first thing I noticed was that the black tank was full! Since I can't go to RV park to drain it, I need to hire a profissional service. I am in Oakland, CA. Does anyone know any professional service that could dispatch a truck with tank and suction pump that sucks waste from the black tank? Tyler