Hey jk lyf I have the kit your interested in on my two door it's the RE7121m i would say there's definitely enough room for 315's I have 285/70/17 duratracs on my rig right now with no armour or winch and the front in my opinion also seems a touch high I will probly add a 1" spacer when I install a set of evo Rockstars in the new year. It rides better than stock I feel it's a good kit for the money but I like it.
Here's a pic as it sits now for reference