| Kanaflex Corporation | Vernon Hills | IL | USA |
| KAT Tank Wash | Catlettsburg | KY | USA |
| Katz, Sapper & Miller LLP | Indianapolis | IN | USA |
| Keehn Service Corporation | Coatesville | PA | USA |
| Kentuckiana Tank Wash, Inc. | Louisville | KY | USA |
| Kraft Tank Co. | Kansas City | MO | USA |
| KTTR Services, Inc. | Kansas City | MO | USA |
| Labelmaster | Chicago | IL | USA |
| Lafayette Sani-Wash, Inc. | Lafayette | IN | USA |
| Lavelle Jurca & Lashuk, LLC | Worthington | OH | USA |
| LBT, Inc. | Omaha | NE | USA |
| Liquid Haulers Maintenance, Inc. | Moline | MI | USA |
| Liquid Measurement & Controls, Inc. | Collegeville | PA | USA |
| Lite-Check LLC | Spokane | WA | USA |
| Littlejohn, Inc. | Spartanburg | SC | USA |
| Lockton Companies | Kansas City | MO | USA |
| M. T. Clean, LLC | Kingsport | TN | USA |
| MAC Trailer Mfg. | Alliance | OH | USA |
| Mack Trucks, Inc. | Allentown | PA | USA |
| Marathon Petroleum Company LLC | Indianapolis | IN | USA |
| Marcello & Kivisto, LLC | Carlisle | PA | USA |
| Marsh, Inc. | Appleton | WI | USA |
| Marvin Johnson & Associates, Inc. | Columbus | IN | USA |
| Massey's Truck & Tank Repair | Phoenix | AZ | USA |
| Matlack Leasing, LLC | Philadelphia | PA | USA |
| MaXfield Inc. | Calgary | AB | Canada |
| McLeod Software | Birmingham | AL | USA |
| MGM Brakes | Charlotte | NC | USA |
| Michelin North America | Charlotte | NC | USA |
| Mid-Michigan Equipment Corp. | Saginaw | MI | USA |
| Milwaukee Valve Company, Inc. | Milwaukee | WI | USA |
| Mississippi Tank Co. | Hattiesburg | MS | USA |
| Mobile Transport Underwriters, Inc. | Indianapolis | IN | USA |
| Motor Wheel Commercial Vehicle Systems, Inc. | Canton | MI | USA |
| NACD (National Association of Chemical Distributors) | Arlington | VA | USA |
| Navajo Refining Co, L.P. | Artesia | NM | USA |
| Navistar, inc. | Warrenville | IL | USA |
| Neel Associates | Waco | TX | USA |
| Nicklaus & Associates, P.A. | Coral Gables | FL | USA |
| Norfalco LLC | Mississauga | ON | CANADA |
| North American Trailer Sales, Ltd. | Inver Grove Heights | MN | USA |
| North Dixie Truck & Trailer Inc. | Lima | OH | USA |
| Nu Seal, Inc. | Broomall | PA | USA |
| Occupational Sleep Apnea Solutions | Irving | TX | USA |
| Odyssey Logistics & Technology Corp | Danbury | CT | USA |
| Ogletree, Deakins, Nash, Smoak & Stewart | Raleigh | NC | USA |
| Ohio Oil Gathering Corp. | Frazeysburg | OH | USA |
| OJ Tank Wash, Inc. | Kearny | NY | USA |
| Ontario Hose Specialties Inc. | Mississauga | ON | CANADA |
| P-T Coupling | Enid | OK | USA |
| Paragon Trailer Sales LLC | Cartersville | GA | USA |
| Partners Specialty Group | Alpharetta | GA | USA |
| Pelican Worldwide | Houston | TX | USA |
| Pennco Insurance Services | Sarasota | FL | USA |
| PeopleNet Communications | Minneapolis | MN | USA |
| Petroleum Fleet Specialists | Warrenton | VA | USA |
| Piedmont Transport | Matthews | NC | USA |
| Pilot Travel Centers LLC | Knoxville | TN | USA |
| Polar Tank Trailer, Inc. | Holdingford | MN | USA |
| Poly-Coat Systems, Inc. | Houston | TX | USA |
| Powersource Transportation, Inc. | Griffith | IN | USA |
| Praxair Inc. | Danbury | CT | USA |
| Prokleen Washing Service | Oakville | ON | CANADA |
| Pro-Tech Industries | Vancouver | WA | USA |
| PSC Container Services, LLC | La Porte | TX | USA |
| PVS Transportation | Detroit | MI | USA |
| QualaWash Holdings LLC | Mango | FL | USA |
| QUALCOMM, Inc. | San Diego | CA | USA |
| Quality Fleet Service Center | Stockton | CA | USA |
| Ramey Chandler McKinley & Zito | Houston | TX | USA |
| Rand McNally-TDM, Inc. | Skokie | IL | USA |
| Ranger, Inc. | Memphis | TN | USA |
| Regal Plastics | Papillion | NE | USA |
| Regions Bank Transportation Group | Alpharetta | GA | USA |
| Reliable Trailer Systems, Inc. | Indianapolis | IN | USA |
| Reyco Granning Suspensions | Mt. Vernon | MO | USA |
| Ridewell Suspensions | Springfield | MO | USA |
| RMC Engineering Co., Inc. | Gilroy | CA | USA |
| Robica-Forman Tank Ltd. | St. Marys | ON | CANADA |
| Roper Pump Company | Commerce | GA | USA |
| RT Services & Repair, Inc. | Carol Stream | IL | USA |
