Who knows what type of tire the
Boler folks had in mind? You're not running those exact tires. Best to go with the tire manufacturer's recommendation. Your tires'
weight carrying capacity is proportional to the tire inflation. If you run them at 30 psi you are running them at a fraction of their designed
weight carrying capacity. I see no logical reason to do that. That would be like buying a chain to hold up a 1 ton
weight, then sawing halfway through a link before hooking it up your weight.
Looking at it another way: there is no possibility that the extra psi could harm your trailer.