Abstract: There is provided a pram frame (200) comprising a first roller attachment point (221) configured to engage with a first roller set (121) and a mechanism (231) configured to engage with the first roller set (121) via the first roller attachment point (221). The mechanism (231) is configured to provide driven steering of the first roller set (121) when a user steers the pram frame (200).

Abstract: A load carrying device comprises a load carrying portion, a roller and an inflation arrangement in connection with the roller for selectively inflating the roller from a deflated state to an inflated state and for selectively deflating the roller from the inflated state to the deflated state, the roller rotatable to allow movement of the load carrying device, the roller comprising: an attachment arrangement attaching the roller to the load carrying portion so that the roller provides support to the load carrying portion; and a body for contacting a surface on which the load carrying device is located.