I know what you mean brother. So the trail is called Holy Jim, you can access it a couple of ways but it's off Trabuco Canyon Rd from where you turn on to Trabuco Creek Rd, pass the small RC plane airport on the right and then a little further up on your left is the entrance. I think this is the exact trail and the switchback where I had to turn around: https://goo.gl/maps/2d849
Be very cautious though, in some areas there's no room for error. The trail is washed out in places where dropping a tire off is a possibility if you're not paying attention and could have...well, lethal results. Also letting other vehicles pass is pretty much impossible without backing up to a wider spot, on a couple of switchbacks you have to make a multi-point turn just to make the turn. I wouldn't recommend a truck any larger than your 4Runner/LC either. Actually, two years ago I ran this very trail with a few guys from here - it was on the technical side even then but at least we made it to the top: http://www.expeditionportal.com/for...uco-Creek-Trail-run-Sat-July-13-12-noon/page3