Originally Posted by tractors1
Trailers I've had in the past had the running lights and tail lights on the same circuit. Are they wired different in an Escape?
No, it's the same circuit in almost any car and in the common 7-pin RV-style towing connector.
The centre pin of that connector is an auxiliary, meaning that it has no standard use and can be assigned for anything you want, as long as the tug and trailer are compatible. A common use is for backup lights; in this case, it could be wired to the backup lights on the tug and a wire run in the Escape for the camera... and for backup lights too if you want. If you do this and tow another trailer, you may need a disconnect switch on this circuit in case the trailer does something different and undesirable with it.
In old Bolers, there was a wire attached to this pin (using the standard colour coding of yellow) and run to the back of the trailer near the tail lamps in case anyone wanted to use it for either backup lights or a dedicated stop (brake) lamp. Is this done in an Escape, or is there just nothing connected to that pin?
Most manufacturers use common 7-conductor cable for the connection to the tug, so even if one pin is not used for anything that wire is still there to be used.
For an earlier discussion in more depth, see Backup lights