Don’t have a landmark but in our bighorn behind the basement wall the drain lines, vents and tanks are visible enough to chart their source and termination.
You can call Heartland Svc ( 877-262-8032, have your VIN handy ) they have, and can email you, a schematic of the plumbing system, applicable to your specific Heartland floorpan !!! I have done this !! Hope this helps !!
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