For the Tough Truck Competition anything goes, highest total points wins. For the drags and sled pulls and the Dyno it's classes as usual. One other thing that has changed is Reddings new track manager is not going to let anything slide, helmets are going to be checked, windshields can't have any chips cracks etc. any use of nitrous requires a jacket meeting SFI Spec 3. 2A/1. Refer to 2007 NHRA Rulebook pg 25 for protective clothing, pg 236 for helmets, Crankshaft center line must not exceed 36" from the ground for trucks running 12. 00 and slower; 31" for trucks running 11. 99 to 10. 00; and 24" for trucks running 9. 99 seconds and quicker. refer to pg 201 for Crankshaft rules.