I'm working through this right now. What really hit me was when I thought about starting the Edge with keyless ignition. I Have to hit the brake pedal first and that activates a considerable portions of the vehicle electronics. Then I thought about driving the RV and how often I hit the brakes; and each time I do I'm initiating the "start" sequence. I can readily see why the battery would run down.
Next question, once the battery is disconnected I guess you have to use the key to lock and unlock the car? Would an ODBII battery tender allow keyless entry to function?
And another questions. If you use the TOAD CHARGER (http://www.lslproducts.net/TC_Broch.pdf), what impact would that have on the system electronics, since you would still be activating the "start" sequence each time the brakes were applied.