Black tank flusher is the best addition to these trailers since round tires. If the flush doesn't work, might leave that water in the back tank while traveling home. Really let that water flush the sensors for while.
Our trailer storage facility has a dump station. I've carried fluids home and drained before putting up for storage. Good luck!
2016 Road Warrior 355
2015 Ram 3500 Cummins SRW 4x4 MegaCab ShortBed
2011 F150 ecoboost - Traded
2015 Jayflight 28 BHBE (sold)
2009 Jayflight 26 BH (sold)