I sure wouldn't put a Duro on any highway trailer. A simple google tells us hundreds of reasons why.
Your Sabre 34 RQLS shows a 13900 GVWR and a 3292 ccc.
I would guess your trailer has 6k axles which a good USA made LT235/85-16 E at 3042 lbs works great for years of trouble free use.
If you want more reserve capacity then the LT235/85-16 G Goodyear G614 or the Sailun 235/85-16 G load range both at 3750 lbs capacity @110 psi have worked for lots of folks. Keep in mind your the tire will have to match your wheels width/pressure and load capacities.