While driving this truck at approximately 45 mph to 50mph the steering locked up and could not turn wheel either way with both hands . It then broke loose causing to truck to take a herd right turn . It ds same thing if you are pulling to left when it frees up causing a quick left hand turn . This is very dangerous as total loss of steering occurred . Luckily there was room to stop . The steering then started working again then after consort distance it happened again . At this point I had a roll back haul it home . This could cause serious injury to me and or my family or someone coming in other lane . This is a totally bad design a vehicle should never be unable to be steered .