trailer wiring

[markg]

I recently purchased a 1999 chevy Sierra 4x4 ext cab with 4.8l for towing my camper but can't seem to locate where to plug the wiring harness under truck any help would be appreciated pictures would be great

 

[oldfoggie]

on my 98 I had to buy a socket, install it on a bracket and then wire it for my 5th wheel rv trailer, the newer vehicles come with these already to go.

 

[powerAce]

This video should give you an idea on location and wiring:

https://www.youtube.com/watch?v=RtmMGf28EeM