Pet Hammocks / Swings Silvercar by Audi August 14, 2019 16:12 Updated Pet-hammock availability is limited and on a first come first serve basis for an additional $25 for the duration of your rental! Ready to request a Pet Hammock? Please submit your request here. Related articles Can I rent a car at one Silvercar location and return it to another? What's the policy on having pets in a Silvercar? Does Silvercar offer surf racks? Does Silvercar offer car seats? What grade of fuel does the Audi A4 or Audi Q5 use?