Liquid hydrogen trailer
A liquid hydrogen trailer is a trailer designed to carry cryogenic liquid hydrogen (LH) on roads being pulled by a powered vehicle. The largest such vehicles are similar to railroad tanktainers which are also designed to carry liquefied loads. Liquid hydrogen trailers tend to be large; they are insulated. Some are semi-trailers. History. The U-1 semi-trailer was a liquid hydrogen trailer designed in the 1950s to carry cryogenic liquid hydrogen (LH) on roads being pulled by a powered vehicle. It was constructed by the Cambridge Corporation and had a capacity of with a hydrogen loss  rate of approximately 2 percent per day. The U-1 was a single axle semi-trailer. The specifications for its successor the U-2, a double axle semi-trailer, were issued on 15 March 1957. Size and volume. Liquid hydrogen trailers are referenced by their size or volume capacity. Liquid hydrogen trailers typically have capacities ranging from gross volume.