Tire brands and life expectancy for 5,000 pound TT?

P and LT can go up to 8-10 years per individual mfg.
ST tires can go from 3-5 years per individual mfg.

Good and bad brands depends on the tires size and load range. Generally the best brand is what a owner is using and the worst is the brand he had issues with.

Tires on trailers range form 13" at 1500 lbs capacity on up to 17.5" tires at 6000 lbs capacity.

So what size and load range are your OEM tires ??
And what is your trailers axle ratings ??