I bought a class 2, Curt brand hitch and Curt wiring package for my 2015 Edge SEL FWD. The hitch appears to be relatively easy to put on but when reviewing Curt's wiring instructions online I did not see that a power cable has to be run directly to the battery. So, where can I run the power wire through the firewall? is there a body plug around the driver footwell for the factory wiring? It appears that the plastic trim panels have to be removed along the driver side door sill plate. I looked over this site and didn't see any photos of where the factory wiring goes through the firewall. And I sure won't run it under the body because that is too hostile an area to run an electrical hot wire. I am connecting two different, small trailers, where each has only brake/signal/running lights; neither has trailer brakes.