I have two problems I need help with.

1. Where is the wiring harness connection located for wiring lights for a hitch?

2. I have a problem with the driver side door lock. It will only let me open it with the key sometimes. I'm getting tired of opening the passenger side and having to crawl over the seat to unlock it!! Is there something I can fix or replace? I am considering installing keyless entry. Would that work with the door not unlocking?

Thanks for your help!