Can a truck drivers wife b able to go with him on a run?

Sometimes. It depends on the policy Wording which needs to be read and understood before taking passengers, whether it be a wife, friend or other non-employee. Truckers Liability claims tend to payout big since accidents can be catastrophic and big rigs can do more damage than say a Geo Metro. Some policies stopped allowing a passenger because it effectively doubled the risk and cost of injuries to those traveling in the truck. It would not be appropriate for an employee-trucker to ask if his wife can be added to the company's insurance policy. This exception may only be considered if the trucker is an owner operator where she is automatically included or can be added as named insured.