What year Wrangler? Earlier Wranglers have a steering wheel lock, which can only be unlocked by leaving the key in the ACC position which will kill the battery after several hours of towing. In this case you'll need a charge line from the MH installed as already mentioned. But be advised that for a couple years this information was not updated correctly in the Wrangler owners manual. To tell if you need to leave the key in, simply determine if yours has a steering lock. Take the key out and see if you can turn the wheels. It will be hard to do, and you'll need to turn them quite a bit to be sure there is no lock.
OEM Auto Engineer- Embedded Software Team
09 Holiday Rambler Endeavor 41SKQ Cummins ISL
2012 Jeep Grand Cherokee Limited Toad