Which tire?

I had a trailer that size and was very happy with BF Goodrich Commercial TA's. Michelin XP Ribs is another popular one. The LT tires come in 235/85 16 but they are the same height as the 235/80 16 so they will interchange.

X3 on what JIMNLIN said.

What jimnlin said above! No currently marketed ST tire will stand up to that size trailer for what most consider good trouble free service life. Chris

I see in another thread you have a 35' Cedar Creek so I'm guessing the trailer has 7k axle which fit your 16" ST E tires 3500 lb capacity. I wouldn't put a ST tire back on a trailer that size.

I would upgrade with the Goodyear LT235/85-16 G614 G load range at 3750 lbs capacity .....
...or the Sailun LT235/85-16 G at 3750 lbs. The Sailuns have became very popular with heavy trailer owners of all types.

Many folks with heavy 14k-15k GVWR trailers upgrade to 17.5" wheels and commercial grade LT f or G tires. All depending room in your trailer wheel well.