The numbers sound good, but there is no way to know for sure other than trial and error. Tell the tire shop that unless they can guarantee that they won't rub, you need to try them for a few miles. Test them with a fully loaded vehicle and a locked (left and right) steering wheel on the most severe terrain you can find near the shop at max inflation, normal inflation and when aired down to the lowest you would use off road. There are variations in anti-sway bar adjustments from one H2 to the next, so no one can speak for EXACTLY how your truck will fit these tires. The section width is exactly 1 inch greater than stock (13.5" vs. 12.5" inch originally). Section width refers to the width of the tire at its widest point under normal inflation pressure, not at the tread. With a backspacing of 4.5 inches, you may be okay. Don't go beyond 4.5" backspacing as this will put excessive stress on your C/V joints.
Wish I could be of more help, but you need to try them out to be sure. Perhaps someone with the identical set-up will reply. That will get you closer, but still only an approximation. Please report back with your findings. Thanks!
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