| Company | City | State | Country |
| Salco Products, Inc. | Lemont | IL | USA |
| Scientific Brake & Equipment | Saginaw | MI | USA |
| Scopelitis, Garvin, Light & Hanson, P.C. | Indianapolis | IN | USA |
| Scully Signal Company | Wilmington | MA | USA |
| Seal Fast Inc. | Houston | TX | USA |
| Selective Software Inc. | Pittsburgh | PA | USA |
| Semo Tank/Baker Equipment Co. | Perryville | MO | USA |
| Seneca Tank | Des Moines | IA | USA |
| Shamrock Environmental Corp. | Greensboro | NC | USA |
| Shreveport Tank Wash | Stonewall | LA | USA |
| Skyline Chemical, Inc. | Ada | OK | USA |
| Snider Tire, Inc | Greensboro | NC | USA |
| Solimar Pneumatics | Minneapolis | MN | USA |
| Southeastern Pneumatic Inc. | Ellaville | GA | USA |
| Southern Tank Leasing Inc. | Demopolis | AL | USA |
| Specialty Fabrications Inc. | Cottage Grove | WI | USA |
| Spill Center | Hudson | MA | USA |
| Sprague Energy Corp. | Oceanside | NY | USA |
| Spraying Systems Company | Wheaton | IL | USA |
| STAC, Inc. | Eagan | MN | USA |
| St. John Truck & Trailer | Muskegon | MI | USA |
| Stainless Tank & Equipment LLC | Beloit | WI | USA |
| Standfast USA | Victoria | | AU |
| Steel Smith Tank & Equipment, LLC | Missoula | MT | USA |
| Stephens Pneumatics, Inc. | Haslet | TX | USA |
| Stuart Tank Sales Corp. | Elkhorn | WI | USA |
| Summit Sales & Service Co. Inc. | Birmingham | AL | USA |
| Sunoco, Inc. | Exton | PA | USA |
| Tampa Bay Tank Wash, Inc. | Tampa | FL | USA |
| Tank Master, Inc. | Santa Fe Springs | CA | USA |
| Tank Trailer Cleaning | East St. Louis | IL | USA |
| Tankcon FRP Inc. | Boisbriand | PQ | CANADA |
| Tankmart International | Laval | PQ | CANADA |
| Tankmaster Div. of Intrans-Corp. | Mississauga | ON | CANADA |
| Targa Midstream Services LP | Houston | TX | USA |
| TAS Environmental Services, Inc. | Fort Worth | TX | USA |
| Tectran Co. | Mississauga | ON | CANADA |
| Thompson Tank, Inc. | Lakewood | CA | USA |
| Tiger Manufacturing Co. | Abilene | TX | USA |
| TMW Systems Inc. | Cleveland | OH | USA |
| Total Distribution Services, Inc | Northport | NY | USA |
| TouchStar | Tulsa | OK | USA |
| Traffic Tech Inc. | Montreal | QB | CANADA |
| Trail King Industries, Inc. | Mitchell | SD | USA |
| Trailer Transit, Inc. | Porter | IN | USA |
| Transcourt Inc. | Oakville | ON | CAN |
| TransMontaigne Product Svc. Inc. | Denver | CO | USA |
| Transport Resources, Inc. | Matawan | NJ | USA |
| Transportation Costing Group Inc. | Rockville | MD | USA |
| Tread Corporation | Roanoke | VA | USA |
| Tremcar Inc. | Iberville | PQ | CANADA |
| Trincon Group | Columbus | OH | USA |
| Trux Trailer & Tractor Repair | Springfield | MO | USA |
| Tuthill Vacuum & Blower Systems | Springfield | MO | USA |
| Ultraflo Corp | Sainte Genevieve | MO | USA |
| United States Aluminate | Baltimore | MD | USA |
| United States Environmental Services, LLC | Jackson | MS | USA |
| United Transportation Group | East Chicago | IN | USA |
| UTEC | Lake Charles | LA | USA |
| Venbrook Insurance Services | San Diego | CA | USA |
| Viking Pump, Inc. | Cedar Falls | IA | USA |
| Vlados | Sao Paulo | SP | BRAZIL |
| VLS Recovery Services, LLC | Hockley | TX | USA |
| Volvo Trucks N.A., Inc. | Greensboro | NC | USA |
| Wabash National Trailer Center, Inc. | San Antonio | TX | USA |
| Walker Stainless Equipment Co. | New Lisbon | WI | USA |
| Wantz Equipment Co., Inc. | West Sacramento | CA | USA |
| WCM Group, Inc. | Humble | TX | USA |
| Webb Chemical Service Corp. | Muskegon Heights | MI | USA |
| Weld-It Company | Los Angeles | CA | USA |
| Werts Welding & Tank Service, Inc. | Wood River | IL | USA |
| West-Mark | Ceres | CA | USA |
| Western Pacific Products, Inc. | West Sacramento | CA | USA |
| Westmor Industries, LLC | Morris | MN | USA |
| Wheelco | Sioux Falls | SD | USA |
| Woody's Fabrication & Tank Repair | Corpus Christi | TX | USA |
| Worley Welding Works, Inc. | Levelland | TX | USA |
| Xata Corporation | Eden Prarie | MN | USA |
| XL Insurance | Exton | PA | USA |
| Yelverton's Truck Repair, Inc. | Selma | NC | USA |
| Zonar Systems | Seattle | WA | USA |
| Zurich Commercial Markets | Philadelphia | PA | USA |
