Modern vehicles have a lot of electronics that are active much of the time, so Jeep (and most Chrysler products too) have begun recommending that the battery be disconnected as the foolproof way to prevent battery rundown. Earlier models removed a fuse and still earlier ones did neither. Electrical system designs change the towing needs evolve with them.
The easiest solution for your Wrangler is to add remote battery disconnect such as the Battery Brain
or an automatic disconnect such as Priority Start
2004 American Tradition; 2014 Buick LaCRosse
Homebase in the Ocala Nat'l Forest near Ocala, FL