There are some holes at Bull Run that we never found the bottom to! The video above was the second time I went through it. The first time, it stopped me in both mud holes but I was able to back up and hit it again. When we took the video for the second run, I think the mud had already been plowed out of the way so I looked easier.
There are some REAL rock ledges and hill climbs there at AMA that I will be the first one to say I'm too scared!! It's a great to place to ride but the Bull Run probably has better mud and the automatic Pioneer wash in the river. AMA also has more miles of trails I think. I may become a member if I think I'll ride out there enough to justify it.