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There are some companies out there that make rims that bolt on to full size truck hub but that take heavy truck tires (80-100psi), there was an article a few months back in Farm Show magazine about these style of rims they claimed longer tire life and better mileage.
changing fluids to synthetic should help as well, you have a lot of gear oil in the rear end, tranny fluid, engine oil, all of those would be good to change.
Then as far as driving goes, you have a vehicle that is designed to tow or haul alot, so when it's empty you can shift alot sooner then you would when it's full.
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