Sounds like your LP Leak Dectector is going off. You apparently have a small leak in your trailer. Have your dealer check it out. When you disconnect the battery, you are simply masking your problem.
I sure would not disconnect any safety device to silence it. You might either have a propane leak, or you could also have the oven pilot on, but not lighted. But don't take away power as this could save your life!
Have a tech do a leak test on your rig. If there is no leak, replace the LP detector. Many times they fail because of age. They are saying now that you should replace them every 5 years.