Yea, no "tech support" or anything on that site, other than the contact info.

Since they are rear and center, I wonder if they are there for a trailer connection.

Trailer connectors seem to be 7 contact:

7-contact Truck Trailer Connectors

-brakes
-L signal
-R signal
-running lights
-license plate light
-interior light
-ground
-on smaller trailers, electric brakes

OR, does it appear they are the wires going into the box?

---maybe---, I'm no vehicle electrician.