will need to floor model as well....however, most of the time the black tank will be right under the toliet and the gray tank next to it. Depending on the model, there might be a 2nd gray tank under the middle of floor for the kitchen sink....
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2015 Rushmore Springfield
Disc Brake upgrade, Goodyear G614 tire upgrade
RV FLEX-ARMOR roof, Mor-Ryde IS suspension