I also have had 2 dead chassis batteries on my 2014 ACE and I religiously check that the battery disconnect switch is left in the "storage" position when the RV is not in use. I have also left a small solar trickle charger plugged into t he lighter socket. The first time, after replacing the battery, I noticed that the radio displays a clock at shutdown unless that option is diabled ( got to be the most dyusfunctional feature ever put on a radio). However, I again have a dead battery with that radio clock disabled. Whatever the drain source is it is larger than the trickle charge input.