Just to note, based on all the check the rim pressure rating advice...
That’s good advice, but that notwithstanding, you could “over tire” it with some G or H rated tires and run lower pressures without issue if you don’t need the additional pressure for the weight.
On my vehicles I generally don’t run higher than needed pressure to maximize ride comfort and minimize tire wear from being too high, although trailers I generally run more pressure than needed. Because tread wear isn’t an issue really, especially on skinny trailer tires and less flex (to a point) generally = a better handling trailer and less heat buildup from flexing.
That said, you can run down the road all day in confidence with G load trailer tires at 80 psi without a care in the world if that pressure is sufficient for the load.