Just in case you don't know, LP Detectors typically have an expiration date of five to seven years. You can test yours with the gas from an un-lit lighter.
I observed a twenty year old RV with the original LP Detector, this test yielded it did still work after over a full minute of exposure to the gas. After replacing with a new one and performing the same test, the Detector alarmed in just a second or two.
Just a thought.....If you are re-locating, you may as well upgrade the Detector while you are at it.
PS: The LP detector manufacturers do not recommend testing the Detectors in this way. I have seen professionals on this site refer to cupping their hands over an un-lit stove top burner and carrying it to the Detector to test it.
Good luck