Croozer hitch -- axle quick release lever on the left? The croozer manual states that to mount the axle hitch [with the hitch on the left/non-drive side and the quick release axle skewer oriented such that the quick release is on the right/drive side]:


  The quick-release lever must be positioned on the right side of the
  bicycle (relative to the direction of travel). If the lever is on the
  left side, the quick-release skewer must be removed and reinserted
  from the right side


I'm not sure I want to put the QR on the cassette side though :/ . Does anyone know why they want the QR on the right here?
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.