On thing I don't see mentioned here is the need to use LOTS of water in the black tank. Just doing a minimum flush will leave the solids in a pile in the middle of the tank. And do not hook up your sewer dump line and leave it open. That will just let the water run out without actually emptying the tank. Wait until the tank is about 3/4 full before you dump. A clear elbow for the end of the poop chute (where it connects to the sewer hookup) will allow you to see if you are getting the tank clean. We got ours at WalMart. Rinse, rinse, rinse. Then add back in about five gallons of water after you close the valves.
Have fun!
