We just purchased a 2017 262RGX Fiver and it also has a go power prewire.
I haven稚 taken delivery yet but I believe (and hope) from all the research I have done that the wires from the roof port go from the roof, past the go-power-prewire-sticker on the wall near the bathroom door at top of stairs, down into the front compartment and into the battery junction box. I also believe (and hope) it is 10awg.
Whether this is true or not, I値l be putting 400 watts of solar (in angle mounts) on the roof and connecting it to those roof ports (even if I have to rewire them with 10awg). I値l put my charge controller next to the batteries so the low voltage (large) wires are a short run and I値l feed small wires up to that sticker where I値l place my battery monitor. With the charge controller next to the batteries (4 6v golf cart) I値l need to build a hood of some kind to funnel and exhaust the off-gasses from the batteries. That part I haven稚 worked out. I am most handy with wood but it would look like hell. <shrug> we値l see. If anyone has any ideas about this battery hood, speak up.
The hitch is being installed tomorrow and we take delivery the following day. Wish me luck.
2017 Wildcat Maxx 262RGX with 4x100w solar panels