Soak it in PB blaster overnight

It is laughing at that 18" breaker bar.

I needed a 1/2" drive 22" breaker bar PLUS to slip the handle of my jack over it (about 4 feet total)

You need more torque on it. Impact is also not gonna help. You need a longer lever hence the jack handle over the breaker bar.

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2018 Ram 2500 6.7L Cummins 68RFE
19k miles -Bright White/Black - Big Horn Sport - Crew Cab Short Bed
2013 X5 35D (CEO's) - Born on 5/17/2013 -
82k miles - Alpine White/Cinnamon Brown/Premium Pkg, Sport Activity/Premium Pkg and Sound/20" Style 214/Running Boards