Southwestern Motor Transport Inc. offers services to Mexico, Canada and the rest of the United States through its network of partner carriers. Over 80 years its operations has increased from being a South Texas Intrastate Carrier to present day operation that includes a 14 state less than truckload coverage. The company s truckload operation runs from border to border with six thru-trailer entry ports into Mexico and thru-trailer service into Canada with service to and from Ontario and Quebec via Detroit. Southwestern Motor Transport Inc. is an ISO 9001:2008 certified company.