The documents do recommend ATF. Both in the Level Up owners manual and the Hydraulic Fluids Recommendations PDF. It's all even in the Lippert DVD that came with our 2018 3791RD.
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2018 Montana 3791RD (SOLD)
2017 Ram 3500 DRW 6.7 Cummins Aisin, B&W RVK3600 (SOLD)
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