hey Ryan, we've stretched the arches on my LC 90mm backwards only, havent touched the front and I recon it looks fine.
I have the tubs cut out of mine ATM and tried to fit 28 x 10.5 x 15's on 10" rims but was too wide, on 8.5" rims sames tyre they fitted fine.
So I think you could get a 275/60/15 on a 8.5" or 9" rim without moving the rail.
Cheers Bullet
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90mm stretch
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90mm all finished
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10" rim from front, 28x10.5
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8" rim from front, 28x10.5