Jeepjunk4: Hi. Mine's an "05 but as part of an under carriage paint job had to release the Axle bolts to drop the belly pan. The bolts for my axle run through the frame channel with adjustable slots. The frame channel "pinched" the belly pan in place.
This may not apply to yours but here is what I learned:
Ensure the trailer is supported from here to eternity b'cuz you don't want it falling on you.
Paint everything while you are in the middle of this project...pays off in the long run.
I dropped my water tank to ease removing the bolts and found out the insulation was "s#%t" from factory...or maybe decomposed (remember this is an '05) I chose the former judging by the evidence.
It is not easy but once done well worth it.
best of luck