[travelin texans]

There's one VERY important thing to remember.
When the RV is connected to a sewer system, whether at a campground or your home, ABSOLUTELY POSITIVELY NEVER EVER leave the black tank valve open, fill & drain as needed. The issue created by leaving the black valve open will require dynamite not vinegar to cure.
I also agree with Marshall on the enzymes! If storing the RV for extended periods they may be beneficial, be sure to add plenty of water when using them, but for everyday use they aren't in the tank long enough to do any good. Most of the drop/pour in products are for odor control & don't do much to break up solids or paper, use if you think necessary.
Using overpriced RV specific toilet paper is not necessary either, I'm sure others will disagree! Any brand the states "septic safe" on the package & is not a bazillion ply will work just fine, again water in the black tank is your friend.