I had that happen to me on a 2013 trailer. The manufacturer had seen it several times on frames they sourced from a popular frame supplier (based on an email that was accidentally forwarded to me...I'm leaving names out because I don't feel like dealing with butt-hurt manufacturers who want to claim I'm making false claims).
It was a pain, but surprisingly easily repaired. AAA sent a flat bed out, picked up the trailer, and took it back to my storage yard +100 miles. That part was a pain--hours waiting for a tow, hours to get it home, transferring everything to my tow vehicle, etc.
After we decided where to have it repaired, AAA picked it up and delivered it to the repair facility. The repair shop took the old A-frame off and welded a new (much thicker one) on in its place. They also replaced everything else that had been damaged (lock arms, jack, stabilizers, wiring, etc).
Total bill with towing was about $6,000. I didn't pay any of it. My collision insurance covered the repair (...all single-vehicle incidents while moving are considered collision no matter what the real issue is...) and the manufacturer paid my deductible.
Still....scary and irritating. It happened on the freeway at +/-55 mph.
But props to AAA. After an initially frustrating period of time getting them to understand the difficulty of moving the trailer (they first sent out two different regular tow trucks), they stepped up and called a commercial towing service and took care of everything from there. It was easy.
FWIW, the repair shop told me the A-frame was an accident waiting to happen--in their opinion, the walls were not thick enough for the application.