I've been taking my mostly stock truck up to some of the lakes in the Lander WY area. It's got rear air helper springs and a traction bar because I get stupid towing trailers, but I'm not sure those help much in the rocks. 235/85 tires, open diffs front & rear. Original 215k mile drivetrain except for a couple rear U joints and a carrier bearing. I drive within its limits, it needs to get me 2200 miles home so I can't beat it too hard. But it does pretty good if I pick the right line and use a little momentum. The front lower control arm mount tabs on the frame take a beating on these trails, as does the transmission crossmember. I try to drag it across the rocks gently!
I went in to Christina lake at night, didn't take many pics.
Took about 3 hours going in, no body damage. Nice lake, and there was still a bunch of snow on the other side.
Hiked up to Atlantic lake, then headed back. Trail looked scarier in the daylight than it did by headlights.
Another 3 hours back out, stopped on the way to help a guy on a big KTM adventure bike get turned around because the trail was going beyond his comfort zone.
Shifted the lower control arm cam bolts and blew out a failing rack bushing, but no critical damage on the trip. There's a clunk I still need to track down.
Went up to Pete's Lake
There's a couple rough spots, but most of it is easy slow going.
That was 3.5 hours each way.
Here's a pic from 2009 when I took my parents to the top of Cyclone Pass on the Shoshone Lake rd in the same truck. I've owned this truck for just a bit over a decade now.
I've been up the shoshone lake road 4 times, but haven't dared to drop down the other side of the pass to the lake. I always wheel alone, so I don't want to get stuck where I can't self-recover. From hiking down to the lake, I'd say a locker and good tires minimum would be needed, neither of which I have.