I've had good luck with Goodyear Fuel Max Tires. The ones on my Impala (235-55-17s) have load ratings pretty close to your current ratings.
Since I put them on the Impala and aired them up to 65 psi, I've gained 1.5 MPG.
Check out the Fuel Max tires. Nothing wrong with car tires on a half-ton pickup.
I keep the E-rated tires on my truck inflated to 100 psi.
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2000 Ford F-350 SC 4x2 6 Speed Manual
4" Slam
3.08:1 gears and Gear Vendor Overdrive
Rubber Conveyor Belt Air Dam
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