Someone, one of these days, needs to measure the ST for wheel fitment so we don't have to guess so much.
Although I do agree with Spiff, -2" offset on a 10" wheel would put 7" of heavy wheel where the suspension has to work a lot harder to control wheel movement. And if it's positive...that's 7" of wheel inside the wheel housing, where it'll rub sway bars, wheel liners, all those type of things.