Is that 3000 lbs per tire a estimate or actual scaled weight ?
Rv trailers with slide outs are notorious for weighing several hundred lbs different side to side...plus running in a strong side wind all day long can over load a tire on the down wind side if it doesn't have any reserve capacity. Tire experts say a 15-20 percent reserve capacity is a better idea.
What is the trailers GVWR ?
Does your trailer have 6k or 7k axles ?
Lots of 16" trailer wheels rated for G tires (3750 lb ) at 110 psi. Check your wheels for proper load and pressure rating.