Odd tire wear

Axle alignment, possibly caused by worn swing arm bushings

 

Alignment, shock absorbers, or both. Or other items, even insufficient lubrication on your 5th wheel plate.

 

Its not unusual for a new trailer not to be aligned properly. Assembly guys slap it together and send it out, they expect the dealer to perform the final adjustments.

 

What is the tire pressure you are running?

 

Checking the alignment is always a good idea on new equipment, but that looks like typical scuffing to me. Have you gotten into any tight places? We see it all the time, we're a car hauler and car lots are usually paved and tight. Tight turns scuff tires, if it scuffs bad enough, since it's a radial, that wear pattern transfers around the tire. You can usually slow it down by rotating the tires left/right.

Check you're wheel bearings/adjustment, suspension bushings, shocks, air pressures, alignment ect. But you may not find anything wrong.

 

Like the others have said, I will also recommend having the alignment checked. New trailer means nothing. Alignment could be off even with brand-new. Also if this wear is on the inside shoulder of the inside tire it could also be excessive axle deflection resulting in excessive negative camber for that wheel or even simply a bent axle or spindle. Again, the alignment will measure this. I would recommend measuring the axle with full load to verify if the camber is correct or not in this situation. It is usually recommended for trailers to be empty for the sakes of safety.