Any harm in leaving the TT plugged in all the time??

For those that leave stuff in their fridge while at home, what items are you talking about? Surely stuff like meat, cheese and dairy have expiration dates and you wouldn't leave them for two weeks in the TT, right? We tend to go camping every 3-4 weeks so I completely empty the fridge and let it defrost. We just load everything into the crisper drawer or another container, so it's only one trip into the house to empty the fridge.