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What you want to heat is the nut where it connects to the bolt. Make sure that there isn't any wiring, or other stuff running through the frame rail which might be damaged by the heat.
Since you've applied WD-40, it will smoke and stink a bit, but after cooking the connection with a propane torch for a minute or so, put a socket wrench on it and work the connection back and forth. It should become more free, and after it has cooled a few minutes, shoot it again with WD, as the threads will accept lubrication more readily, now.
The pipe is likely to assist you in breaking the bolt, but that is a last resort if all else fails. Good luck.
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There ain't nothin' more powerful than the odor of mendacity -Big Daddy
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