Well lucky for you my wife and I will be leading Seven Mile on Tuesday, and tail gunning for Fins'n'Things on Friday (one of my favorites, definitely fun).
In all seriousness though, make sure you don't have step rails on as well as take off the mud flaps if you have them. Depending on your wheeling experience, it will definitely help out which lines you take through the obstacles. Also, it wouldn't hurt to learn your trucks limits, learn to gauge where your front/rear bumper are from the driver's seat without actually seeing them, be comfortable with your turning radius, as well as going in reverse. Try to remember what you just rolled over just in case you have to go over it backwards to get a better line through the obstacles.
Something that really helped me out was to look under my truck and learn where the important/uncovered spots are. You ARE going to scrap something under you rig (don't let this freak you out, it's the nature of our beasts). There is a difference in sound from scrapping your body (expensive to fix), frame (no worries over time you'll scrap your frame on all sorts of stuff), lower shock mounts on the rear axle (can be expensive if you bend the heck out of it), leaf spring mounts also on the rear axle, lower control arms (no real danger of scraping that, depending how hard of a hit on it, might need an alignment), and the next most scrapped item, the front cross member (be careful of that one, it's close to your oil pan). Try to be mindful of the sounds your rig makes and the way the scrapes sound. The first time I went wheeling I freaked out at every scrap I made.
