We always run the refrigerator on 12 v while traveling - never run it on propane - in Washington it's against the law! Our charge line from the TV, a 2000 GMC Jimmy, is a 10 ga with an isolator and we have never had a problem with the TM or with our former tent trailer. You may have a smaller line if it is plugged into the TV original wiring. You can run a new wire all the way from the TV battery, through an isolator and a breaker or fuse to the plug. With the isolator, the TV battery is disconnected whenever the ignition is off, so you wouldn't run the TV battery down. With this setup we always arrive at our destination with a full battery and frozen food. In fact when we first got the TM we didn't know to only run the "frig" on 4 and we almost froze everything! LOL
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