Very sorry this is 6 years late!! This is offered only to add to our cumulative body of knowledge. Basic details only. Rule book has much more information/restrictions for each class.
DT: Mid/mini and full size diesel trucks of American and Foreign manufacturers. Body unaltered in height, width and contour. Engine swaps allowed with 2% setback of wheelbase. Many other restrictions. 9 engine sizes.
MDT: Modified Diesel Truck. GVW of 14,500 lbs. or greater.Modified Bodies not otherwise legal for DT class. Full size trucks are 750 cu.in. (CID) max. Mini/mid are 500 CID max.
UDT: Unlimited Diesel Trucks. Body highly modified. Any frame and running gear. If race weight is =>14,500 lbs then multiple engines allowed! Full sized pickups limited to 750 CID and mini/mid sized = 500 CID.
HH2: Highway Hauler. American and Foreign =>14,500 lbs. Stock cab mounted in original location to the chassis.Unaltered in height, width, length with all stock panels mounted in original location. Many other body restrictions. Must have both driver and passenger seats. Any diesel engine supplied by normal channels. Only pure water for water injection. 2 axles only.
HH3: Highway Hauler. Same as above but with 3 axles.
