? About emptying camper tanks into external holding tank

The macerator pump can work at both ends -from camper to tank and then from tank to wherever you are going to dump.

The macerator can enable you to pump the sewage into a toilet at a friend's house, for instance.

If you haul your portable tank in the bed of a truck, you will not have to take it out of the bed with the macerator. You will need a 12-volt supply to power the macerator.

It pumps through garden hose. I would recommend a heavy-duty hose for sure.