I dont know why you would need a laptop for MB assistance. I would call them on your cell phone.The best deal going is Mercedes Roadside Assistance. They will change a tire, bring gas, have batteries aboard, and will stop at the dealer if you need a fanbelt or some other item. You will pay for the part but the service is free. They have access to the parts department (IOU) and can arrange a tow. If you properly maintain your car you should not question the reliability!