Try to borrow a Mustang wheel and tire from 1995-04, the offset on those is fairly close to the limit of what will fit these trucks. My first wheel combination was a Cobra wheel(17x8 and 30mm offset), with 255/60/17's. Those are an easy fit, but can use a 1/4" spacer to move them out a little.
So the ideal offset is not 30mm, likely no more than 25mm. But the wheel width pushes the limit up front the most, 9" is hard to fit in front without a perfect offset, and tire below 275mm etc.
I have some Volk Racing GTC's that are 17x9's and 16mm offset, they will take some machining to make work. But they stick out a bit more than most people would like, the offset should ideally be in the 20mm or so range. These would be fine on a truck with the wide OEM flares, but mine has no flares. So I bought some used front flares from a 2nd gen with the smaller flares with running boards. I've got 275/55/17" tires, I was trying for 18's but never found wheels in that size.
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