A quick look at jeep's website shows the stock tires on the 2016 hard rock rubicon are 255/75r17s. Just shy of 31s. As long as the tires are either stock or not much bigger, they should fit.
I don't think you'll have any backspacing issues simply because wheel adapters usually add 2-3 inches of backspacing.
I have 2-1/2" over stock springs, with 2-1/4" bumpstop extensions and 31" KM2s. The tires stuff up and almost rub the fender while going over obstacles. The compressed length of my shocks are the limiting factor but if my tires were any bigger at all I'd have to add bumpstop so I'm sure I'd be rubbing with stock springs.
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