Please post pictures of the little red buttons.
Your travel trailer has two to four electric power systems. Most typically have the first two listed below.
30 amp 120 volt shore power (possibly 50 amp 240 volt)
12 volt battery
solar panel on the roof
There are two ways to store a travel trailers that have the first two systems. You will need a digital voltmeter. They are cheap. Get one at your local hardware store or on line.
The first storage method is to plug the shore power cord
into an electric outlet. Use an adapter if you do not have a 30 amp 120 volt outlet. Even a standard 15 amp home outlet can provide enough to keep the batteries charged. You may need a heavy duty extension cord and an adapter to plug in.
There may be one or two battery disconnect switches. Manufacturers may install a disconnect near the entry door. Sometimes after marked disconnect switches are installed near the batteries. Leave both of these switches "on".
Check voltage at the battery terminals. Voltage should be above 13.2 volts if everything is working. (Discharged batteries should be charged for 14 to 18 hours before this test.)
Monitor water level in flooded cell batteries after charging. Flooded cell batteries have caps on top for adding water. Fill to full mark using distilled water. Charging consumes water.
Lead acid batteries in good condition can be stored disconnected for 6 months. Check battery terminal voltage periodically and recharge 14 hours before voltage drops to 12.4 volts. Check water level after charging. Charging consumes water.
Disconnected means fully disconnected. Sometimes the manufacturer installed switches are called disconnect switches. They do not do the job.
Disconnect by removing the negative cable from the battery terminals.
Some owners install a disconnect switch next to the batteries. This works OK.
Lead acid batteries should be stored fully charged. Fully charged means 14 to 18 hours using a high quality voltage regulated charger like the one in you travil trailer.
Don't let your batteries sit discharged for any longer than necessary. The longer the time and the deeper the discharge, the quicker they will fail altogether. Batteries discharged flat need to be fully recharged immediately to protect long life.
I wish you good luck and happy trails ahead!