I was planning on a max of 3 pumps (for supply). Since I'll likely stay with an aerator pump setup, I'll of course need more to drain the sacks.
I like the idea of the scupper, however... I do have a two questions.

-Do they fill your bags when driving without the pumps on? (I use the rule 1100 aerator)
-Do they fill ok when you're not moving?

Thanks in advance.