The wiring comes down the driver's side pillar of the windshield. I seem to remember a previous post that someone found their wiring bag hidden behind the trim - it had not made it all the way to the area under the dash.
Keep lookin' - it's there somewhere.
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'14 Winnebago Vista 35F, '14 GMC Terrain
BlueOx Towing Pkg, SMI Stay-n-Play
49 States & 7 Provinces visited in MH | WIT W112365