Trail guide is some one with extensive knowledge of said park and knows it like the back of their hand, or is some what familiar with said park and has extensive 4wd knowledge to get wheelers out of any situation that may arise, is what i believe they are referring to. How can you be a trail guide if you are not familiar with the park or the trails? The trail rating system in TX isn't all that great what would be a level 10 for CJ might be a level 3 for a JK. It is very easy to get lost in a park if you are not familiar with it, especially with out a map.