Frozen Lugs on Trailer

Bought a 6x9 trailer that needs a face lift, floor/sides/rust removal/paint. Got it home the other day and one tire went flat. I can't get the bolts free to change it out. Let some penetrating oil sit on it overnight with no luck.

My next thought is heat and an air wrench. What method do y'all recommend?

Cheers,

Tim
 
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