Not sure about Duracel's but IMO you cant go wrong with AGM. They will cost you more up front but are maintainance free and should last longer.
I installed Full River AGM 6v in mine. I will still able to fit them below my steps but it was a tight fit. I had them for about 6 mo now and love them so far.
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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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