You probably should list the size and load range in question as you will get input from folks with small trailers and 14" tires which doesn't help anyone with a heavier trailer.
I buy used rv trailers over 10k lbs. Oem tires were long gone however my current trailer had new Marathons on it installed by the dealer. I sold the tires and wheels to a lawn service guy on CL.
I don't use ST tires so I bought 4 new 16" wheels and 4 LT E tires. Ran the first set for 55k+ miles and 7 years and have around 35k-40k miles on the second set.
I've done all my heavy trailers (rv and non rv) this way.