What trees?
I did the event last year and dont remember anything but a few cottonwoods along a creek.
It was a fun event just the same, I voted it enduro of the year for RMEC. Lots of fun sandwashes and interesting terrain that runs along small ridge tops that consist of decomposed clay. Last year it rained the night before the event and the trail was great, they routed us down a dry creek bed for about 10 miles but it wasnt dry in the morening! It was a good time all around.