Assuming you have the same load range and size tires on the vehicle that it came from the factory with, the starting point for vehicle tires is the pressure listed on the tire certification label, not the max on the sidewall of the tire. This is because a vehicle tire has two primary functions, to provide contact and traction with the road as well as supporting the weight of the vehicle. In order to achieve the proper amount of road contact between the tire tread and the road, the pressure must be reduced below maximum on the tire if the tire is not supporting the maximum weight.
If you want to run your trailer tires at maximum pressure on the sidewall (cold inflation, not running), then you simply increasing load reserve. Tread contact with the road is not as big a deal as with vehicle tires because the main singular purpose of trailer tires is to support the load, not traction. The trailer does get a bumpier ride, though.
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