We've been at a few stations where there has been a line of dumpers.
One thing I DIDN'T do is rush, put on the gloves follow the procedure that works for me, take at least 5min flushing the black with the pump. And clean up after, leave it better than you found it. If anyone complained..I just asked them to do the same.
We kind'a lucky now in that I have rigged a dump into our sewer, the line runs right next to the pad. For the last 3 seasons have I been able to dump in my own yard.(just like Fado). Makes it a lot easier to completely flush. Also found that running without dumping right away seems to break things up in the BT.
Bob