I am assuming if UY2 is not listed in the RPO code in the glovebox then I do not have the wiring for a 5th wheel under the bed. Is this correct?

Correct

I carry kits that you allow you to unplug your female trailer plug on your rear hitch or rear bumper and then plug into this wiring harness which then has one end that plugs back into your male trailer plug that you just removed the female plug from and then run the other end into your bed. Everything needed is included in your kit. This is a great, easy way to add a trailer plug in your bed! Let me know if you need a price!

Thanks for the responses. Mreeves, thanks for the offer but i actually already have the harness.

Moved to towing.