Sewer Solution worked pretty well for us, until I broke it. Here is what I did wrong: our sewer cleanout at home is slightly uphill from the trailer (by a few inches). Usually, I put the nose of the trailer down when using the Sewer Solution, to raise the back of the trailer, where the sewer valve is, so the sewage could flow just barely downhill to the cleanout.
One fine day, I forgot to lower the nose . . . .
The Sewer Solution was pumping slightly uphill. It was doing ok for a while. Then too much back-pressure built up in the system and the connector exploded. A very memorable event.
Don't do that.
It's funny now, but it wasn't then.