Do need wheel spacers for the rear?

[simonton6.4]

Ordered a set of 285/70r17 tires for my dually do I need spacers for the rear? If so what's the minnim I have to have to not rub tires? Also any one have any pics of there trucks with that size tire trying to decide if I want a leveling kit or not. Thanks

 

[Derkperk]

My buddy runs 285's on his ram with a 1" spacer. You definetly don't want them to rub.

 

[simonton6.4]

Yeah don't want them to rub but don't want two feet between my tires ether