With ST tires, I prefer to run at the Max Pressure, or no more than 5psi below. Any tire that I'm familiar with specs max pressure Cold, ie. sitting still overnight. I look at it this way.... running ST's at the high end of rated pressure, you may risk wearing the centre tread a bit more, and perhaps have a rougher riding trailer. Running ST's at low pressure, you raise the odds of blowing out a sidewall (in an already shaky class of tire) quite a bit. Given the choice (and personally not having live or delicate cargo that cares about the ride), I'm sticking with running my ST's at the high-end of their rated pressure. If you think of it JJZ, pls give us an update say 1+ years out, as to how these Transmasters are behaving for you. Rgds, D.