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The kind of wear on one side indicates an alignment problemm.
This can be because of hitting something, but when I look at picture of your TT hiched up, I see a verry low towbarr so buttum up.
This lifts up the rear axle.
In Europe are some most single axle trailers profided with a Delta- axle, wich give toe in or out alignment when lifted or pushed down.
Placing your towbar higher and / or using a weightdistribution hich, gives straighter TT so both axles in the middle.
I dont know if these Delta-axles are also used for tandem axle TT , but you could find out if so .
Further I enlarged the tire picture and read next
ST225/75R15 8PR 113/108L loadrange D
Maxload 2540lbs AT 65 psi. 8PR is the European eqivalent of D-load.
L is speedcode for maxspeed 120km/75m/ h.
For that speed the maxload is calculated.
If Delta axle I would try to upgrade to LT in E or F-load. Then first follow the advice of Tireman9's post and weigh and take enaugh reserve.
This kind of wear is more if tires deflect more.
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