Wait for a fairly warmer day, crawl under the trailer with a really strong
light and examine every square inch of the frame.
If there are any cracks you'll see them with a strong
light.
If found , find a welder that can patch them up.
If you don't see any try again next year.
My
Burro had failed at the "A" area on both side sometime in its past and was repaired, the repair is better than the rest of the frame.