I checked into having an RV dump put in at our house and it was crazy expensive. The plumber noticed a 2" clean out for the vent line on the side of the house and suggested a Flo-Jet macerator.
Hundreds of dollars cheaper and works great dumping right into the clean out, on the vent line. I found some adaptors to fit the hose right to the 2" clean out so no worries of splashing.
On the toyhauler, I ended up running wires from the batteries to the end of the drain. I have then setup with a quick connect for hooking up the macerator. Super easy to plug in the macerator and I am ready to drain. No worries of draining the batteries as I use mine while plugged in at home or would be easy enough to start the generator. Takes maybe 10 minutes to drain both tanks and wash the black tank.
_
