I use one all summer and dump a 45 gallons tank. I do have a slip on valve in place of the cap on the trailer. I usually empty the hose by lifting it and alowing air from the tank vent in while the hose drains in the tank. I have a short hose on the vent connection that I listen to for when gets close to full. I use 3 loads that includes the rincing.
I have been using a 20 foot hose and it can just be held up between loads, and no need to empty all the time when checking level of the tank. Its a one man operation and my duty as the outside man. Practice with the grey warer first you'll get it.
Barbara and Laurent, Hartland Big Country 3500RL. 39 ft long and 15500 GVW.
2005 Ford F250 SD, XL F250 4x4, Long Box, 6.0L Diesel, 6 Speed Stick, Hypertech Max Energy for Fuel mileage of 21 MPusG empty, 12.6 MPusG pulling the BC. ScangaugeII for display..