My Aspect has a couple of drains tubes coming through the floor near the rear. They are drains for the plumbing system and water tank. Haven't seen anything petroleum like substance coming from them. The again, I don't have the rear trunk (wish I did) so not apples to apples comparison.
You can go on the WI website and pull up plumbing diagrams for your specific year and model. Click the "Resources " tab near the top of the page and enter your info. You will also see electrical diagrams, etc. this is one area where WI shines.
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2009 Winnebago Aspect 28B
Ford E-450 V-10
2012 Honda CRV
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