Parasitic loads can be a big issue. I am not sure what all the possible loads are but in my TT I have the frig, LP detector and the antenna booster. The antenna booster can be turned off, if I remember to do it.
The single 12 volt battery will last the wife and I two days which is enough when we are traveling between campgrounds for a couple of days.
At home with shore power disconnected, the battery will last 5 to 7 days just sitting in the yard. So at home the TT is plugged into the 120 volt power or the negative battery lead disconnected.
