I left the wheels on when I put new shocks on mine. Keeps the shock at the normal length- not extended or compressed. Then jack up the vehicle in such a way as to not compress the shock and get a jackstand under it.
Hate to say this, but there's no way I'm crawling under your Jeep with a 2x4 on end standing upright on a floor jack.... please be careful!
If you've exhausted most options, go get a bolt puller at your local Harbor Freight store.
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