2021 No Bo 19.5 bent axle

OPs trailer from the manufacturers brochure says it has Torsion axles.

A bent or out of round wheel has the potential to cause considerable stress to a torsion axle at high rates of speed from excess bouncing. But I sort of doubt it was the main cause of the axle damage but may have been a contributing factor..

I seriously doubt any repair shop whether it is a big rig or small mom and pop can fix a torsion axle once the rubber has been damaged which is highly likely what gave out since the rubber in a torsion axle is the weakest link.

Op mentioned it is a single axle so "scrubbing" as you would know from dual or multiple axles does not happen..

Both big rig trailer repair shops I mentioned did rubber torsion axle service of all sizes. Torsion axles have other parts that aren't rubber. However the OP didn't say the trailer was squatting more now.
Granted single axle trailer tires don't side scrub going around corners but a single axle tube or the spindle (torsion or std leaf spring axles) can bend when hitting a curb at 5 mpg.
At that speed usually a cut sidewall and bent rim damage from the curb can be normal.

The company I sub contracted through sent a letter to all their subs stating they weren't going to give any more out of warranty service to those who used torsion axles on mostly cargo/enclosed trailers we used as construction job site tool trailers.
I had a 22' tandem enclosed tool trailer I used on my job sites and could not keep the tires from odd wear patterns and premature wear on one side of the tires tread or the other.
Back to the trailer mfg and traded it for the same trailer with std leaf spring suspension. Torsion axles just couldn't stay lined to specs in those conditions.