We are not in the lightening belt that's for sure. That is not to say that we never have lightening.
What I worry about most is being somewhere and the power sources are old and over worked.
Will definitely put in new batteries on all my detectors before heading out. The dealership was supposed to do this but not sure they did. Like you, better to be safe than sorry.
Now that you mention a fire extinguisher, I'm not sure there is even one in the coach. That will go on my list of things to check. Thanks for reminding me.