So, you're not going to share the information you received?
Add to the communal WTW knowledge base?
That's a rather odd presumption to make, and not in a very collegial manner, but so be it.
For this camper, the documented location is just aft of the front vent cover, and just outboard of the cover towards the drivers side. Note that this is for an early 2006 build, a Grandby model, and non-extended cabover. The location is clearly different than on the newer models, as referenced above where there would be access from under the front push panel.
Stan also indicated that 4WC uses a several inch rectangular aluminum plate that is welded to one of the fore/aft roof support members as a wire feed and connector support. This plate has a small diameter hole drilled through it for wire routing and for the connector. Nominally, if one presses on the roof at the expected feed/plate location, one may be able to feel additional support underneath the roof sheathing where the plate is located. It seems like this is the case here, but I'll definitely be drilling a small pilot hole and have some sealant on hand.