An update
I will wait until daylight to get pics, but the 275/70s are on.
No issue under normal driving in the rear. They might just touch the TR sliders under compression, but it won't be anything to worry about. It might just help to clear cached mud off of them, and might not contact them at all.
In the front they are just kissing the sliders at full lock. And I really mean just barely. I haven't tried it, but I would wager I could still wiggle a feeler gauge between the tire and slider. I'm familiar with significant rubbing from some of my earlier fitments, and this isn't it. It is so slight, I expect my wife wouldn't notice if she drove it, and that is saying something. I expect it will self rectify within a thousand miles.
They also just barely brush the plastic where the front lower driver's side wheel well liner bumps out into the wheel well. That will be less than 5 minutes with a heat gun to rectify.
There is no issue with UCA clearance on either side.
I wouldn't have any qualm about putting type S cable chains on the rear, and just trying to stay away from fully compressing the rear end.
If you have done the requisite mods, to include a front bumper, and Compos, you will not have any significant issue with this size. In my case, my TR sliders are now the limiting factor on tire size.
With a different slider, or some Fab work, I can see how you could go bigger.
As
@ArmyRover seems to have gone everywhere the LR4 with 35's did, I'm going to call it good for a while and be happy I can still fit some chains on the back to get through a CALDOT or Colorado checkpoint if needed.
Pictures for you guys coming tomorrow.
PS. Am I the only weirdo around here that gets strangely happy over new tires on my Rover?