You can get 235/80r16 in load range g, I’m running the hankook vantara, they have been awesome and you can feel a difference when towing, the trailer feels like it glides down the road. you can still drop them down in pressure and still float over the sand no problem,
I had the same problem with mine a few years ago, turned out to be the brushes, it was a cheap fix but you have to take the unit out of the trailer to change them.