PETALUMA  (AP) — Survivors of a crash that left one man dead after a nearly two-ton mobile pizza oven slammed into their vehicle are suing for damages.

The Press Democrat reports 32-year-old Dwayne Usher of Vallejo died in the August crash on Lakeville Highway. His then four-year-old and eight-year-old sons and a woman who was in the passenger seat suffered injuries. They have filed separate civil suits.

Investigators determined that a hitch on the trailer carrying the oven disengaged because it couldn’t handle the weight. The safety chains weren’t in place and the trailer didn’t have an automatic braking system.

The lawsuits have been filed against the driver of the van toting the oven, Rosso Pizzeria owners, as well as the trailer manufacturer and its owner.

Each plaintiff is seeking unspecified damages.