Tire Bulge Question

[72step]

Yet another tire question. Here's the deal. I have 15 x 10's on the rear of my 72 stepside with the 275/60/15's. The tire where the peak of the bulge is, is like 3/4" from the bed on the inside (I'm sure you all know how 275's bulge out towards the center on a 10" wheel). I'm planning on buying some new wheels, and would like to keep a 10" width wheel in the rear. Is there a possibility that I could find a tire size on say a 17x10 that would not bulge, and, therefore, give me the little bit more room I need back there??? Thanks....