Les remorques G-518 trailers  furent fabriquées par de 20 firmes

• American Bantam
• Ben Hur Mfg. Co., Milwaukee, Wisconsin
• Century Boat Works
• Checker Motors Corporation
• Covered Wagon Co., Michigan ^[b][9]
• Dorsey Trailer^[10]
• Gerstenslager
• Henney Motor Company
• Hercules Body,^[11]
• Highland Body & Trailer Mfg. Co, Cincinnati ^[12]
• Hobbs Trailer & Equipment Inc, (then) Texas ^{[citation needed]}
• Hyde,
• Keystone RV,
• Mifflinburg Body Company, (were in) Pennsylvania
• Naburs,
• Nash-Kelvinator,
• Omaha Standard Body,
• Pke,
• Queen City,
• Redman's Trailers, Connecticut,
• Steel Products,
• Streich,
• Strick Trailers, Indiana,^[13]
• Transportation Equipment Corp, Missouri
• Truck Engineering Corporation, Indiana
• Willys Overland,
• Winter Weiss Defense Trailers, Denver, Colorado