I do not know what the JEP version is, but I am running a set of the 108Q in that size and am very happy with them (I like taller and skinny tires - used to run 215/85-16s and 235/85-16s on my two previous Range Rover Classics).
My FJC is significantly heavier than a stock truck. It has an OME heavy/medium lift, front/rear ARB bumpers, 9K winch, DO sliders, ARB touring rack, steelies etc.. I carry about 80-100 lbs of stuff in the back and usually a 70 lbs tandem kayak on the roof.
Although it is my DD, my wife and I also use it mainly for expeditions/camping/kayaking, where we usually encounter dirt roads, some rocks and mud, rain (heavy at times) and sometimes moderate snow. The tires are great off-road, and the on-the-road handling has never been a problem. In inclement weather, I just try to remember that it is a tall and heavy truck, riding on tall and narrow mud tires, and drive accordingly.
They are definitely louder than an AT tire, but are acceptable, and in my case, the howl caused the roof rack cancels out the tire noise anyway. The wear is also acceptable - I currently have about 8K miles on them and estimate that they will last at least another 20K. Finally, although I think I would have been happier with a 255/80-17 (if they made it), size-wise the 255/75-17s look good even with the lift.
BTW, you can get them (108Q) at Mavis Tire for $108 + shipping.