Solution to the black water tank at a full hookup site for the wifey. Put a direct water feed toilet on the inside and this 4 wheel tote on the outside of the RV. Hook up the black water drain to the tank and when time to empty hook up a drain hose to the tote, flip the drain chute down and into the waste outlet at the RV site. Yes , care given to the way it is emptied but it will work. I have the plastic hose holders to keep the drain hose off the ground and flowing downhill.
https://www.etrailer.com/Plumbing/To.../TNS20123.html