Disconnecting the Trailer Connection when staying Overnight.

ktmrfs wrote:
GM varies. The 6.6 diesels do NOT disconnect power. Gassers vary, I don't recall what my manual said exactly but I believe vary based on if you have the dual battery option or not.

I think you are right, my former vehicle was a D/A and someone told me that was so, I should have checked as suggested by Sound Guy.
If it not necessary to unplug it is just another item that one could easily forget....on a bad day. Thanks!