Originally Posted by highlife4me
... I would think that there would have been a steel plate or at least a very large washer below the bolt head due to the stress from weight of people going up and down the steps. ...
My 2001 23b step bolts were just carriage bolt heads against the thin plywood sandwich. Had there been a washer or steel plate then perhaps I wouldn't have needed to remove my sill plate, cut the vinyl to expose the bolt heads and then re-install with a plate for extra support. I presume the design hasn't changed over the years.
All the frame tab fasteners, step bolts, etc. I have come across have been carriage bolts into the thin layer of plywood. After the exposed nut/bolt rusts then the carriage bolt square in the aged plywood can't hold up
to the twisting torque so the head generally spins.
If you are under warranty then maybe use some wood blocks or other temporary support under the step assembly until you can get the step repaired. If out of warranty then I believe you will need to cut the vinyl to access the bolt heads.