I have a 2019 3130re so my tanks will be different from yours. I believe they went to one piece "rotoplast" tanks in 2018 or 19.
They are mounted differently too but the pipes and valves are the same.
While I had the bottom off I added 1" insulation (silver stuff) around the frame perimeter and bottom to help prevent freezing while winter camping.
SmartSHIELD -20mm 48"X25ft Reflective Insulation Roll, Foam Core Radiant Barrier, Thermal Foil Insulation Panel - 0.8 Inch Thickness, R-23 https://a.co/d/doAuEEx
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