Hiring Class A Solo Owner Operators! Great Benefits!. H - Hazardous Materials Endorsement. N - Tanker Vehicles Endorsement. TWIC Card Endorsement. Based in Oak Brook, Illinois, the Heniff family of companies is North America’s premier leader in liquid bulk transportation services. We operate approximately 2,000 tractors and 5,000 trailers through our network of over 100 locations with expertise in chemical transport, food-grade transport, rail transloading, third-party logistics, ISO depot oper…