I also tow a 2008 Wrangler. You should leave the ignition in the ACC position(that is the first click. DO NOT turn it to the ON position(two clicks). Also under the hood in the fuse box you should disengage the IOD fuse which will turn off any accessories. All you do is pull up on the fuse until you feel 2 clicks then when ready to drive push it back down in place. A knife blade type battery disconnect will also work but you will loose all of your radio presets when you disconnect the battery. This thread should help.
https://www.rv.net/forum/index.cfm/fuseaction/thread/tid/22720717/print/true.cfm