read more about them and see a couple more examples at http://www.roadtransport.com/blogs/big-lorry-blog/2010/07/double-eagle-no-double-header.html#more Moving tanks with single and double ended semi tractors (push-pull units for the heavy tanks)
read more about them and see a couple more examples at http://www.roadtransport.com/blogs/big-lorry-blog/2010/07/double-eagle-no-double-header.html#more