Your employer is only liable IF your employer was at fault in causing the accident and your injury--liability is based on fault. So if your employer was at fault (for example: the accident occured becaue they did not maintain their trucks properly and the brakes or steering failed), you could sue them for compensation: medical expenses; lost wages; "pain and suffering." But if the employer was not at fault--for example, you were speeding or driving distractedly--then they are not liable and do not owe you any compensation.If some third party was at fault (e.g. you were hit by another vehicle), you could sue that third party.