My family has had Maxxis tires on 4 trailers over the last few years with no problem. After 3 years and no particular tire care, not even a hint of dry rot. AS others have suggested I strongly recommend Load Range E tires if you stick with the 15” size. Maxxis makes a 225/75R-15 Load range E that gives 1160 lb. more carrying capacity than the range Ds that might have come on the trailer. Tires lose carrying capacity every year they age and the OP is very close to the rating when new if range D.
Also as pointed out there is a good chance of alignment problems. I’m going to PM the OP about a shop in our area that will align trailer axles. They found 3 out of 4 wheels out of alignment on our first, lightweight, inexpensive, poorly manufactured, trailer.
Len
