Navistar offers electronic stability control on all PayStar models now. Also, 8,000-, 13,200- and 20,000-pound lift axles are available direct from the factory. Frame rails of 10.25 inches by 3/8 inch are now standard equipment on the PayStar 5900 set-back axle. The 10.25-inch frame rail provides a strong vocational frame. MaxxForce 11 and MaxxForce 13 diesel engines will be available in the PayStar soon.