A standard fifth wheel hitch doesn't flex to the side, only on the long axis. A classic example of the extreme was a recovery I did. It was a single screw moving van (luckily almost empty) that missed a drive and jackknifed into a fairly steep ditch. The left driver was on the road. The right side had a good foot of air under it. To prevent any further damage, we jacked it up and put blocking under the wheels. That took the strain off the hitch. Then we opened the hitch and pulled the tractor out from under the trailer, which we had dropped onto a sheet of greased plywood. Then we cross chained the dollys and slid the trailer sideways back onto the road. He hooked up and drove away unscathed.

 

Well, this was 12 years ago so hopefully the OP got it figured out!