Not trailer hitch bolts but was in a similar situation with an axle nut to change a wheel bearing. I actually broke a breaker bar by standing on it. A good impact wrench will break it free, along with a good prior dosing of PB Blaster or Aerokroil or similar penetrating oil (not WD40).
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2008 Liberty Sport 4x4 Automatic
Jeepin By Al 4" Lift Kit
BFG KO2’s 245/75R16
Full MOPAR skid plates
Rock Lizard Skink Super Sliders
AtTheHelm Front Recovery System & Roof RackM116A3 Trailer build thread: viewtopic.php?f=72&t=77997