The Tacoma bed outlet should have been this way from Toyota 

Guild Outfitters created a simple solution that many Tacoma owners have had to deal with. Using their easy-to-install, plug-and-play wire harness, you can use the full potential of your bed outlet. Plus an added bonus with this kit is getting adding a wall outlet into the interior of your Tacoma. In this video, I will show you how to upgrade your factory power invertor and I also show you how you can add a wall outlet to the interior of your truck.
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Guild Outfitters inverter harness - guildoutfitter...
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