I helped a friend move a Jodel D9 Bebe, for which we borrowed a Slingsby Capstan (two seat side by side glider) trailer. The D9 disappeared into this mobile cathedral so easily that another couple of D9s would have easily gone in as well.
It would certainly be worth asking at a gliding club if they have any empty trailers, although a lot have wing supports which take up a bit of space. With enclosed trailers for modern gliders, height may be an issue.
A car trailer is going to be around £35 to £45 to hire for a day.