I use this trailer from Stema, Germany:

http://www.stema.de/stema_anhaenger_de_166.html

perfekt for the threewheeler, you need three ramps which will fit inside the trailer, german quality, you won't regret

Achim

4 aircooled cylinders, 7 tires, not waterproof: my m3w Bluebelle (2013) and my 2CV Gundel (1990)