Hi Sean,I’m planning to head out in September, the lift I want is back ordered, is a stock LC200 have enough clearance? I’ve seen everything from need at least a leveling kit to a guy drove a stock RAV4 out and did the river crossings.
September should be beautiful, but be prepared for possible chilly nights. Just a few days ago, it was 80's during the day, and low 40's at night. I'm not sure of the clearance on your rig. Two of the guys on our last SoCal TLCA club run brought stock 100 Series. One of the 100's dented a running board on the way in, but he said it was his own carelessness. The other 100 (no running boards) was fine. I'm not sure if either one had adjustable suspension, but you could put the question out on our SoCal TLCA Clubhouse page (just below this one).
About a month ago, I went in with a stock Wrangler on A/T's, and a near new Grand Cherokee w/adjustable suspension & highway tires. Both were fine. Too late for a short answer, so the long answer is you'll probably be fine if you're cautious & chose your line with care. There are really only a couple of potential obstacles. Re: water crossings - this late in the year they're only hub height, so no worries there. You've probably driven through deeper SoCal flooded intersections!
Have fun!