Great thread!
Great thread - I was thinking of starting up something similar. I too am not likely to do any real mods apart from tires and maybe sliders (but probably not - got other savings priorities lately).
Anyway, here's my offroad playlist on youtube:
YouTube.
So far a lot of it is from when I still had my Xterra, but as time goes on there will be more TRD ORP footie - just haven't got around to it yet. CO has had an epic winter and I got the 4Runner last fall so there hasn't been a ton of chances to get out just yet.
Anyway, my early impressions are that the 4runner is head and shoulders more capable than the Xterra and the Xterra made up over Imogene Pass pretty well, so as a benchmark, I think we can assume the 4Runner will be able to do all of that and more.
All the youtube videos have links to trail details in the descriptions.
I haven't had the time get the Imogene Pass footage up just yet, but here are the links to the route:
Imogene Pass - Colorado Offroad Trail
and then the link up to get down the other side:
Yankee Boy Basin - Colorado Offroad Trail
Also for reference, I managed to link-up these two trails in the Xterra. Again, I know this isn't directly answering the question but I think it's relevant data.
Deer Creek - Colorado Offroad Trail
Saints John - Colorado Offroad Trail
My thoughts thus far are that the stock t4r can handle anything rated at 5 or less on TrailsOffRoad.