Abbadox, realize tire opinions vary as wildly as......every other opinion.
From swearing off Chinese tires to living and dying by the use of LT tires to running tires for x number of years.
A guy cant say run for 5 or 6 years definitively, because conditions are so variable. A tire that sits in the sun in the southwest will age FAR quicker than one that is garaged most of the year between uses.
Generally a "cheap" tire is cheaper for a reason but that doesn't mean it won't work.
Some like to have belt and suspenders and an elastic waist band. Other are ok as long as their pants don't fall down and others yet are ok with some plumbers crack!
But unless something is weird or you plan on extreme use, no reason to expect new(er) tires that haven't been on the road won't do the job for a while.
14&15" trailer tires are cheap and don't fetch much used. $100 a tire giver take is what most sell for. Selling newish cheapo tires may get you $200 and you'll spend $100 in mount and balance to swap them out. For the $100 net return on the old tires and the extra $100 you'll spend for quality tires, its a wash. Run the cheap tires for a while and get some use out of them.
Example, I bought a newer used utility trailer to move a bunch of stuff to AK. IDK, couple years old, barely used. Had the cheapest possible tires on it. Bias ply.
Trailer loaded heavy, hauled butt to AK, wore half the tread off the tires (not sure how, but they were seriously worn 2500 miles later). They worked and I got my moneys worth out of them. If one popped, that's why I had a spare. Since we wuz going to AK, I took 2 spares.
Last year bought a new cargo trailer on the other side of the country to haul some stuff back to WA. Loaded that little trailer with china tires to the gills, drove 80+mph back to WA. 2000miles later they were fine.
"Most" "issues" with trailer tires, IMO, are a product of age, road damage, pressure, severely overloaded (maybe 1 axle of a tandem on torsion axles is overloaded and the owner doesn't recognize it type of situation) or, in the past, if they said Marathon on the side lol.
2016 Ram 2500, MotorOps.ca EFIlive tuned, 5โ turbo back, 6" lift on 37s
2017 Heartland Torque T29 - Sold.
Couple of Arctic Fox TCs - Sold