Between trips I store in an outside area not at the house with no access to electricity; I always ensure the traliler is a little tounge high (to allow for water to run off the back when it rains), Roof vent is open, fridge open, curtians closed, fresgh water and gray tanks empty, black tank will have about two gallons of liquid and chemical, enough water in the toilet to ensure the valve is covered and doesn't dry out and I pull the battery and hook it up to battery tender on a float charge. I also have "Damp Rid" containers put out. I also do a few other minor things also.
2015 F250 6.7L Lariat Crew Cab
2017 Jayco Jay flight 28BHBE
Equalizer 14K Brand WDH
2013 Jayco Jay Flight 26BH (Sold)
CMSgt USAF (Ret)
"GO BLUE". University of Michigan