11. Maximum height of 40". 12. Maximum weight of 1275 lbs. 13. Approach and departure angles of 45 and 40 degrees, respectively. 14. Must reach 50 mph on hard surface. 15. Special bracing for a pintle hook setup. 16. No aluminum to be used for cylinder head. 17. At least 4 cylinders. 18. 8 of the 70 vehicles to made had to be four-wheel-steering.