It will almost surely use the same baseplates as the Acadia and Outlook - the only possible difference is the placement of the tabs to connect the tow bar, which can be impacted by the front fascia design (and its only the fascia & trim that distinguishes the various makes from each other). Both Roadmaster & Blue Ox have equipment for Acadia and Outlook but they will probably want to confirm that they also work on an Enclave before marketing them for it. You might be able to get a free set up if you let them use your Enclave to do so.
Yes, the batery will go dead. I believe your Enclave owner manual will say to disconnect the negative battery terminal, a real PITA. See the previously mentioned Acadia and Outlook thread for info on alternatives.
Former owner of 2004 American Tradition and several other RVs
Home is in the Ocala Nat'l Forest near Ocala, FL