Where are the jack stands located? On the frame of the trailer, or on the axel plate? They should be either under the axel plate or under the axels, not just under the frame. If you put them under the axels, keep them as close to the frame as possible.
This must be step one on bring her home, right? Putting new tires on is a good first step!
Are you going to check the brakes and bearings while you have the wheels off?