I don't about the 2013 ST 30R, but my 5er 335SS has the low point drains right underneath the hook up panel with the grey water and black water drainage. Look underneath the trailer and find two plastic tubes sticking out of the underside of the trailer. Sometimes you have to look more than once to find them. Usually they are near the HOT water tank.
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Boomer, the Better Half and our Yorkie - Ellie
2012 335SS
2009 Chev 2500HD 6.0 L gas
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