Dear Mr. Meras,
Thank you for posting your request on History Hub!
United States World War II Army Air Force and Air Force accident reports up to 1955 are in the custody of the Air Force Historical Research Agency, 600 Chennault Circle, Building 1405, Maxwell Air Force Base, AL 36112-6424. The web site is https://www.afhra.af.mil/.
You may wish to search The British Newspaper Archive - for Suffolk to obtain an electronic copy of the newspaper to help you with identifying the U.S. Army person killed during the truck accident on August 10, 1943.
Once you know his name, we suggest you request his Individual Deceased Personnel File (IDPF). IDPFs from 1940- 1976 for personnel with surnames that begin with A-L are in the custody of the National Archives at St. Louis (RL-SL), P.O. Box 38757, St. Louis, MO 63138-1002. For access to these records, please contact RL-SL via email at email@example.com. For the IDPFs of personnel with surnames that begin with M-Z, please write to U.S. Army Human Resources Command, Casualty & Memorial Affairs Operations Division, ATTN: AHRC-PDC, 1600 Spearhead Division Avenue, Department 450, Fort Knox, KY 40122-5405.
We hope this is helpful. Best of luck with your research!