Ted , I do not know the maximum. However I have received a quote (Very High) to ship my boat from San Diego to Texas. She is 52" Overall length, 15' beam and 26' from the keel to the top of the pilot house. I understand there are truckers that will take the boat west to east through Mexico. They have no bridge problems and the cost is much less. As soon as I have some information about this I will let you know. Any one else out there with this kind of info, please join in. Marty Livingston Exodus II Marina Del Rey, CA