I have the W/D prep also, stubbed out the same way as yours. I could be the washer is vented to the toilet vent. On mine, the garage toilet is within a few inches of the stub outs so that's my guess. A normal, I say normal plumbing scheme would want it to be that way, less roof vents and penetrations and less ABSand labor.
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2013 Voltage 3800, 2012 Chevy 3500 HD
2010 Yamaha V Star 950
2009 Yamaha Raider
Volunteering with Habitat for Humanity Caravanners
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