This first video is just a quick look around the spot. It has a bit of everything. Big boulders, (too big for RCs) piles of big rocks, long runs of smaller rocks, sand with a rock to dodge here and there. Behind that, grass in a park with a paved trails. (got to watch the muggles and their dogs though...)
In this second video, I tried to do a bit of running on 3 different types of terrain. This is where the Summit really shines. Low gear w/diffs locked for crawling on the rock pile. Unlock diffs but leave it in low for running on the rocks that are not piled up. Then, go to high gear and run at speed on the sand, being careful not to hit any of those rocks at speed. It's un-edited and trying to hold the phone while driving for most of it, so forgive my sloppiness. I have a headband camera mount I'm going to try soon, which should clean it up a lot.
The Summit is not a fast truck, but on this terrain, the Summit is faster than anything else of this scale. Its tall suspension with tall, plush tires let it just fly over those fist-sized rocks, and I can occasionally hit one in the sand without busting it up too much. Anything lower and faster would either have to be driven slowly or would get wrecked right away.
One of the videos has some info in the Video Description; check there for details.