A cargo hauling mechanism for safely transporting long materials under a vehicle is disclosed. The cargo hauling mechanism includes a support assembly suspended from the frame of the vehicle and a support assembly suspended from the hitch of the vehicle. Each assembly supports one end of the cargo and has two horizontal members that clamp against the cargo to securely hold the cargo in fixed position during transport. Long cargo is slid into the support assemblies from the back of the vehicle and the support assemblies are manually compressed with a clamp at each end of the support assemblies.