Tying into the bathroom sink supply lines is the way to go. Not sure I would run a drain line to the outside unless you hook into the gray tank line. Most places don't allow open gray water dumping. You can tie in the drain line to the bathroom sink drain line, too. That wouldn't be very difficult at all. Best of luck.
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Paul & Pam
2015 Fleetwood Discovery 40E, 2016 GMC Canyon 4x4, Blue-Ox
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