I'm currently full timing in a 28' bunkhouse.
What I've learned so far is in
This thread The shower heads are garbage
This one is a good upgrade for the ~$15.
The ceiling vent fans are garbage too.
This one is worth the $115
Have more poo hose than you think you'll need. I have 3 10' sections and a 5' section (with a "Y" as well because I have a gray tank for my kitchen sink too. It's nice to hook them both up because the kitchen tank is tiny).
A short and long hose for fresh water are both useful. I also carry a 50' garden hose for hosing stuff off and for using the sprayer for the black tank.
Get a tote for your poo hose and accessories.
Get used to thinking about your families waste products more than you thought possible.
I have been having good luck with "unique" enzyme for the tanks. It does a decent job with the odor and I don't notice many solids when dumping, so I assume that it's breaking stuff down fairly well.