The men had been pressure-washing the truck when the storm hit, WSVN-TV reported. Andres Telles, 31, the owner of the truck, died. Fidelmar Montero and Miguel Lopez, friends who were helping Telles with the job, suffered bad burns and were taken to Kendall Regional Medical Center.
Janet Suarez, who allowed Telles to park his truck on her property in southwest Miami, said she and her 16-year-old son heard a loud clap of thunder.
"We went outside, and all three of them were on the ground," she said.
Dominic Rodriguez, Suarez's son, said he and his mother, guided by a 911 dispatcher, tried to administer CPR to Telles.