need advice -stuck bolt at rear A-arm

the lower A-arm that has the long metal bushing through it, I got one bolt out but now the other side won’t come out and just spins the whole bushing.
I tried putting the other side bolt partially back in and adding a second nut to tighten it as much as i could. Still no luck using an electric impact gun.
I don’t have an air impact gun but i will go try a $50 one from harbor freight if thats what you guys think it will take.
Any suggestions on this? The a-arm is fine, but i need to remove it to get the differential bolt removed that’s behind it so i can install a prop shaft.
2009 sportsman 800

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