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First, you need to understand that tire size plays a small role in the rolling resistance of a tire. Within a given size, the rolling resistance can vary widely - up to 60%. And changing tire size has a much smaller affect than choosing the right tire.
You will want to stay away from LT tires. They are built with materials that a bit more rugged, but that also means worse RR.
Since your truck originally came with 235/75R15's you don't really have much in the way of options for size anyway. I'd stick with the 235/75R15's and select a tire that best meets your needs.
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