Do you need to purchase an extra base to use this in two different vehicles. Eg mums car and dads car??

Hi Sarah, thank you for your enquiry, the Evenflo Symphony LX Harrison is a one-piece seat, it does not have a removable base as it is a convertible seat, not a capsule, this means it can be installed in your car both Rear facing & Forward Facing. We hope this helps.  ?For further information on this or any of our other products available, if you follow the link https://www.babyonthemove.co.nz/store-locations/ this will take you to our online store finder. Here you can find contact details for your nearest Baby On The Move Store where one of our team experts will be happy to assist you in your product search and help answer any further questions you may have. We hope this has helped with your query.