delrob,
I can't say that I've ever heard that before. We have had two previous units 30fks Cardinal and A 2005 Holiday Rambler Savoy. We always dump the black tank before dumping the others.I'm looking forward to the new Montana with the black tank flush. That should be quite an improvement over the old fashion way.
One more thought, if you are in a campground with full hookups the ideal setup would be to have your camper level. I would not want to raise the front of the trailer in order to dump the black tank.
Good luck and enjoy your trailer,
Michael& Diana
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