Cargo can be that heavy of oversized that transport by road is not allowed or too expensive. Transport by water is the alternative than.

Transport by barges or pontoons (mostly within Europe) are an example of that but also seaworthy pontoons or heavy lift vessels when the destination is outside of Europe. SCS HLT determines the most efficient way of shipping and also provides sea fastening facilities, roll on/roll off ramps, load spreading materials, winches, blocks etc.