I think many of the levelers used ATF (Automatic Transmission fluid) but some (like the Big Foot brand) use Dot 3 brake fluid.
Do a search for your brand (and model) on line and see what they suggest.
Let us know what you find out.
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2017 Axis / 25.4: Big Foot Levelers, Aims 1200 Watt inverter, Ceramic Window Tint, Full River AGM 6V batteries, Front Hellwig Sway bar / Rear Track Arm, Safe T Plus Steering Stabilizer, PD 4655 converter, Hard Wired Surge Guard, WEboost + WiFi Ranger, LED Headlights/Driving lights, TPMS, Surge tank, Tornado flush, Viair Compressor
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