Tom,There are two 12V terminations, one per side, in the bed. They are for owner custom 12V applications. I do not know amperage.
The inverter in the truck bed is part of one of the higher-zoot optins, Luxury or Lariat. It also has a 12V plug alongside the 120VAC inverter output plug. It is mounted on the drivers side of the bed, near the tailgate. Outlets are covered with flexible rubberish covers that apparently are to seal out water intrusion/corrosion, etc.
The 400W version is in-cab only, in the back wall of the console between the front seats, and it also has USB power, maybe 2 ports/versions of USB.
If you want the bed outlet, either buy the upscale package, build one from parts purchased yourself, or buy the components for that outlet from a dealer or other seller of OEM parts.
OEM parts would be a dealer sourced item unless you can find the part numbers and someone has them for sale. I do not know the numbers as I am not a dealer nor employee.Tom,
To buy the oem parts for the inverter in the flex bed. Wher do you tap into the wiring harness? I have XLT, but I can’t seem to find the wiring to hook up the light, light switch, and the outlet.