Hi, Dylan & all,
I would use the propane,
Then WD-40, while still hot. (don't breath fumes)!
Then I would squarely hit the top of the bolt a few times, (carefully, don't
break anything)!
to jar it loose, with a fairly good sized metal ball peen type hammer.
Then try it.
If it's still stuck,
While repeatedly striking the socket wrench (not ratchet)
while attempting to turn.
This may require a helper.
As always, lots of WD-40.
best of luck,
John C.
SLC, UT...