Went on an Adventure 4x4 run last fall that had an H3 along. I believe it was stock. Had no issues with Coyote Canyon in Anza. That may not really say all that much as I've seen a well spotted and a couple of rocks stacked street tires 4runner and FJCruiser make it up there also.
this thread but thought I'd add a little info of my own. Last week our wheeling club had some new people show up and one guy had a H3. It had a 2" lift on the front and 33" AT's. To it's credit it did every obstacle I did and made it up everything except the last hill. I made it with lockers. He could not although his rig had factory limited slips front and rear. The H3 did drag it's belly on a lot of rocks but it did better then I expected. I'm Toyota for life but it was cool to see someone abusing their H3 for a change. Here are pics for your viewing pleasure.





