back spacing and sizes

what do you think about a 15x10 rim on rear ?

I mean, it’ll probably fit. But with the springs in the stock location it doesn’t get you anything, a 275/60/15’s “measuring rim” is a 15x8”. So really it just makes the backspacing more difficult, you’d need a 15x10” with a 5.5” backspace, which really doesn’t give you enough spring clearance. Meanwhile a 5” backspace might not give you enough quarter clearance. The 275/60/15 will be a bit on the stretched side. Not crazy or anything but there’s no real reason for it.