Hi mate,
To get an idea of stock off-road capabilities watch this;
Reliability / common issues / maintenance etc. is covered fairly well by this
https://conflictedracer.wordpress.co...erokee-diesel/
For what it's worth I have a 2010 Limited. Have owned it since July last year. Had a 2016 Triton before this. I am very happy with the WH diesel. Plenty of power. Tows my >2 tonne boat with ease. Off road I have yet to put it through its paces besides a few rocky tracks and some beach work. Handled both of those nicely.
I changed the glow plugs when I bought it as it was a little slow to start. Easy job. Other than that I've just put diesel in it and serviced it. I had a WJ diesel about 7 years ago. Also a good car but the WH feels a lot quicker!