If you have rented a single stroller and decide you would rather have a double stroller or have rented a double stroller and decide you would rather have a single one, you can modify your reservation at any time BEFORE you arrive subject to availability. If your stroller has already been delivered, this change CAN NOT be made by editing your reservation to change the stroller type. The original reservation will have to be edited to shorten it and a NEW reservation must be made for the desired stroller type. We will have to pick up the original stroller and it will have to be cleaned for the next family. We can not just swap one type of stroller for another.