Clutch
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You actually have a sticker in your drivers side door jamb that tells you exactly what the payload is. I don't know what cab configuration you have, but unless you have a reg cab, I'd highly doubt you are even close to 1,800 lbs. I looked at a double cab at a dealership recently. Opened the door, looked at the tag—1,200lbs.
My Tacoma is a measly 1,000lbs.
DC 4WD 5.7 should be around 1600+ lbs. (well at least according to the website)
https://www.toyota.com/tundra/features/mpg/8342/8252/8275