Brand new to anything but tent camping

NanciL wrote:
Disconnect your battery when it won't be used.
There are parasitic loads, such as the radio and Co detector that will drain it.

It's also a good idea, depending how your trailer is stored, to remove the batteries if there are in an outside box. Outside, as in out of the trailer itself, such as on the tongue. On our tent trailer, which we have sold and moved up to a TT!, I had the batteries disconnected but still in the boxes. Someone came through our suburban residential area one night and cut the straps on the boxes, cut the wires to the batteries (which were disconnected anyways - you don't have to be smart to be a criminal) and took the batteries. They were well prepared as they took five others in our area - very brazen.
Once removed be sure not to store them on concrete as that drains the batteries also, put a scrap of plywood under the batteries if stored in the garage. my 2 cents, worth about 2 bits with inflation.