You mentioned the one use that may exceed the rating of a ClassIII, being pulled out of the mud. Although the IIIs and IVs are similar structurally, the IVs are usually made a little more rigidly such that a side load (like being yanked out of a ditch at an angle) is less likely to bend anything. The frame brackets typically extend farther up the length of the frame and that's what gives you a lot of the rigidity. Unless you're really just stuck on the looks of the ClassIII tubular, go ClassIV and have a little piece of mind. Whatever you do, stay with the 2" receiver.
Dan
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2005 Silver CRD Limited

245/75R16 GoodYear Duratracs
Fumoto drain | ProVent CCV Filter
Stanadyne FM100 filter | Cummins fuel pump
GDE Eco | SEGR | BoulderBars | FrankenLift | Frankenskids