If you find a solution without penning them up... I would like to know. We have guinea fowl and peafowl that are on our vehicles all of the time. What is sad, is some people don't come over just for that reason.
They must like the shiny. Mine have never gotten on any of our vehicles (nothing new and shiny on this farm!). Now my roof...the other day I thought I had rats running in the attic, then I went outside and realized it was guineas running back and forth.