Tires for ranch edition

[T-Rod]

So the rims on the ranch edition are different widths front to back. I would prefer them to be the same so I can buy a spare and it will work no matter which tire/rim I might have a problem with. Is this possible? Is there different offsets I have to worry about? Also I was thinking 30” tires. The stock tires are 27”. Any info would be appreciated, thanks