Congratulations on the new Melbourne.
We are quick dumpers too. Before leaving our site, I transfer a lot of our remaining FW to our black tank. Lots of water, makes the solids flow easier. I try to leave about 5 gallons in the fw tank before heading out.
I also grab a pair of disposable gloves, I have in the cab with me.
Except for the last dump of the year, I always leave fluid in the waste tanks. Nothing worse than a dried crude in the tanks.
After dumping if there is a line put the sewer hose away, I then pull forwards and finish up. I wash my hands and dump 3-5 gallons of water back in the black tank, and add Pinsol, verse the normal toilet chemicals.
The water in the waste tanks slosh on the drive home, and help keep the tanks clean. This also helps prevent the dreaded poop pyramid.