25 psi is what i run on the street... why would you be running 45 psi on the street? just because there is a max pressure on the sidewall doesn't mean that's the recommended pressure for all vehicles. that max pressure rating is for max load capacity. i'll bet you dollars to donuts that if you run your rig across teh scale it's only about half what the max tire rating is.
on my old work truck the tires were rated at 75 psi. when i was empty i ran about 40-45 in the rear duals and about 55 up front. fully loaded GVW 14.5K lbs, i had the front at 65 and the rears at 75.