Croozer hitch -- axle quick release lever on the left?
This is about adding a hitch for a bike trailer. I can see why the company recommends to have the quick release on the right (cassette) side, whereas it is usually on the left. The hitch mechanism needs room and is often secured with an additional strap. By putting the quick release to the right, there is no danger of the hitch (and the strap) interacting with the quick release lever.