This is my truck. You can see that the fronts have little to no sidewall bulge. That's why I'm thinking the front might have worked better with 15x8's.
This is my daughter's truck, the only pic I have of it at the moment with this wheel/tire combo mounted - 15x8 rallys with 275/60's. Wrong bodystyle, but correct wheels and tires. Sorry about the distance, but this is all I have. 275/60's are generally accepted as the perfect tire on 15x8 rally's - nice sidewall bulge on a stock rally.