If your trailer doesn't have a black tank flusher, get one of those black tank wands with the spinning spray head.
And get a Johnnie Chok to keep the toilet gate open.
Dan-Retired California Firefighter/EMT
and Zoe the Wonder Dog(R.I.P.)
2016 PrimeTime TracerAIR 255, pushing a 2014 Ford F150 SCREW XTR 4x4 3.5 Ecoboost w/Max Tow Package