Honey wagon

A honey wagon is a mobile pump-out truck that comes to an RV parked at a campground or boondocking site and empties grey and black holding tanks on the spot. Useful for long stays where you don't want to break camp just to reach a dump station.

Common in the US, Canada, and Australia. Typical US fee: $25–50 per visit plus a per-gallon charge. Confirm the operator's hose reach (15–30 m / 50–100 ft) and that your dump valves are accessible. The name is a tongue-in-cheek nod to the smell. In Europe, the equivalent is the stationary motorhome service point — mobile pump-out is rare outside large holiday parks.