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I'd lower it, pull the front shaft if its a 4WD. You might want to check into getting that CEL fixed since on some ECUs if the light is lite, it switches to a richer fuel map to prevent engine damage.
Duck tape and cardboard could close off the bed gap
Fuel warmer is not going to do due much, if the lines run over the exhaust manifolds they are already getting headed some.
WAI could help
Hows the gearing? Since you actually tow, deep gears are fine, else running a numerically lower ratio would help but it could take you out of your power band.
Then the usual trick of airing up to the max psi on the sidewall
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