Although I am not 100% on this, I would think the line goes from under the bed (blue main line coming from pump/city water connection) to the passenger side wall, routed around the bathroom on the passenger side at floor level and then to the fridge behind the back wall of the bathroom behind the toilet. On mine, I don't see any of the small ice maker line anywhere before the blue main goes into the wall back there, so I would guess that the ice maker line junctions off either under/behind the fridge or to the side by the sink, as the Thor tech suggested. Since I haven't taken the fridge out I didn't look there, but I also haven't looked for the valve to winterize/dewinterize the ice maker yet. I'm sure I haven't found EVERY access panel yet, so it is more than likely tucked in with other heat/electric lines under the fridge.
2016 Thor Hurricane 35C with pups Piper and Annabelle
2013 Ford Fiesta toad
FMCA - F457085
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