All gliders are designed to be transported and stored in trailers. The trailers are purpose built and, as you would expect, quite long.
Guidance on the applicable regulations, including those relating to ‘indivisible loads’ are described in the BGA’s Trailer Guidance publication.
More detail can be found at:
There are a number of online sources of helpful guidance on towing trailers and maintaining trailers. For example;
Sailplane & Gliding magazine archive (eg Aug/Sep 2002)