Liquid-hydrogen trailer

A  liquid-hydrogen trailer is a trailer designed to carry cryogenic liquid hydrogen (LH2) 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 (LH2) on roads being pulled by a powered vehicle. It was constructed by the Cambridge Corporation and had a capacity of 26000 L 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 28400 to 49200 L gross volume.