Between a rock and a hard place! As mentioned, running on any power with the TM closed requires the exhaust fan to be on. The use of 12v to run the refer and the fan will quickly exhaust the battery. I have no problem using propane when closed and the fan doesn't draw much power, although others may correct me on this. But it is not a good idea to travel while on propane, again, others may correct me on this! So, you would need to open the TM and switch to propane and turn the fan on, lower the TM for overnight storage, open the TM when ready to leave and switch back to 12v, and lower the TM again!!! Be sure to leave the fan on while traveling on any power. Any chance you could just leave the TM open over night and close it before you leave on your trip?
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