My use is a weekend/daily driver and long trips, with at most going on some fire roads or easy, light trails. So at that, these are excellent in stock form. But if there was one mod I would do, it would be tires. I am waiting for my tires to need replace before getting new tires (or before my grand trip to Alaska, what ever comes first).
I have factory running boards, but I am not planning on ever doing any serious off-roading, not now at least. I was going to get rid of them, even put them for sale on this forum, but changed my mind when I noticed how nice they look, and that my wife and MIL uses them.
I think not so much major mods, but little things are useful; some extra lighting especially in the back, off-road accessories like a strap and hi-lift jack with knowing how to use these things to get yourself out of a situation, and those roof top tents are pretty cool also.