Just to set things straight.....
We have checked bearings, nothing wrong but put in new ones
We have had the axle and suspension checked by a company that does transports.
The trailer went there exactly as it is when we leave for a trip. No issues.
We have been told by a few people it could be tires, we have to change them anyway. If the problem is solved great.
We appreciate all you have suggested and as you can see we have done the things suggested. We will wait and see what new tires do and then go from there.