The torsion bars store a whole lot of energy, enough for 4 of them to do most of the work of lifting the shells in a 90 degree twist. It could be fatal to be under the trailer when that rod popped off of the end. Assess whether you'd prefer to leave this to someone who can do this in a pit or on a lift, and can keep their body away from the rod end.
If you go ahead with this, wear a hard hat and eye protection. Definitely raise the shells first. That will take off a lot of the energy, but something less than all. It might be necessary to drive the bolt in a bit to get the end of the bar aligned with the hole it has to go through. It's not advisable to hammer directly on tempered steel. Use a rubber mallet or put a piece of wood between your mallet and the bar. Push it back where it needs to be. Put the pipe clamp on.
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