I have ATS flares. Van is not lifted except for about an inch due to heavier rated coil springs (4400 I think... whatever is the next step down from 4600).
Running 265/70R17 in the front (235s in the rear since its a dually). Tires fit fine, but there is not enough space for tire chains when turning. I trimmed the fenders near the door before installing the flares. Before next winter, I'll trim the inside of fender flares too (outside of fender flares will not need altering).