Couple of other things to check. 1) Do you have an electrical switch inside the freezer door jamb (usually on the top when you open the freezer door). If so turn it off.. It's only needed to reduce condensation around the freezer door opening. You don't need it for normal use. 2) How about your TV antenna amplifier switch.. do you turn it off when not in use? 3) Does your rig have an engine heater for winter use? Found that a friend of mine had one on a breaker and it was on all the time (even in the summer!). This may not drain your battery but it will usually take some 120V. power.