Dickie,
You will receive both answers. The manual says not to jack on the axles. I personally do not lift the trailer with the axles. I jack on the "I" beam and try hard to be very conscious to ensure I and centered on it. Also the Trailer was connected to the truck so there was no angled weight on the landing legs.
This topic is my post on doing the wet bolts. Yes it is for Moy/ride but does address the your questions on jacking, jack stands and most the wet bolt questions.
Good luck, be safe and ask any questions I have not answered.