We lived in the fiver for 4 months while our son and his family were having a house built and lived in our house. The trailer is in the back yard and had 50Amps and water.
I used a FloJet and 50' of 3/4" garden hose to get to a cleanout at the kitchen drain (to septic system).
The Flojet worked perfectly AFTER we sorted out a manufacturing problem. On the first one, purchased from Amazon based on delivered price, the motor froze up the third time I tried to use it. I called customer service and then e-mailed them a picture of the I.D. plate on the motor and they air shipped a replacement (entire unit) the same day under warranty.
Emptied the black tank every three days after that without a problem. I did run the grey tank into a dry well by the back fence and didn't bother pumping it, but I could have.