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Don't forget you can go to super singles for the drives and trailer. The steer tires can go to 100psi and the drives to 105, if you are not in the habit of curb hopping you can go to 110 on the trailer to reduce rolling resistance if you are running duels. I had run as high as 120 in both drives and trailer before but it didn't seem to make any difference as far as mileage, but made a difference in ride so went back to 105 and 110. This was on Bridgestone 22 inch standard rubber. Guys running 22 and 24 inch low profile tires reported much the same results.
If you have side fairings on the tanks, look into adding another 4-6 inches of a flexible material to lower the sides.
To the flaps on the sides of the sleeper, add some more material until you are about 12 inches or so from the trailer.
If you have tarp loads, try to mold the tarps with the load to try to keep it as smooth as possible.
I have not driven trucks now for 10 years, so some of the tech on the tires may have changed since my time.
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