It's going to be next to impossible to remove ALL the waste water from any of your gray/black tanks. In fact, I had to repair the handle on my waste tank recently. My gray tank was supposedly "empty" from the last trip as I always drain to a trickle. I used a 5 gallon bucket to drain any remaining waste water from the gray tank and noted about 3.5 gallons. Based on the position of the coach, water can cavitate in a low lying area and remain there.
Your black tank is around 30 gallons and I would suggest, as others probably do, to keep a couple of gallons in the tank, along with a deodorizer, cleaning agent, and/or water softener. Look up "GEO method" for black tank maintenance. And remember to never use bleach down the black tank as it can degrade seals and such.
Our tank is 3 seasons old and works like it did on our maiden voyage.
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2017 Keystone Bullet 308BHS in Saddle.
2017 RAM 2500 Laramie Mega Cab 4x4 Hemi 6.4L
2008 GMC Yukon XL Denali (SOLD)
Hensley SwiftArrow Control Hitch with 1000 lb Spring Bars
Me, DW, (3) little DS's, and 1 rambunctious Boston Terrier
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