I have a Subaru that the battery goes dead when towing, so I just bought http://www.ebay.com/itm/301976566770?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT & have installed it on my car &...
I do leave the key in the ignition while towing, even in that "secret" position. Just lock the doors with the spare key. Key fob will not work if key is in ignition. Let me know how it works! ST