15x10 on Duster

I have a 15x8 and that with with a 8 1/4 and a 28 in tire 275/60/15 I also have SS springs so I dont believe it will hit My 28 in tire wasnt close to hitting the lip either. I dont understand how 2 more inches would be such a problem when im going to use the same size tire just 2 in wider, even if I need to roll the fenders I will do so. And Most Likely this would be only for Racing rims unless i can find 2 more wheels like mine in 15x10