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295/70/18 is closer to 34" than 33".
Just google tire calculator. Once you find a calulator that is easy to use just start looking at tire sizes and putting them into the calculator. But remember once you have the tires installed on the truck you will loose a little height.
Depends on the width. I think you would be fine with something like a 9 inch wheel with 5 or 5.5 inches of BS but I think you would have to do some trimming if it's a 9 with 4.5 inches of BS.