A support device for a ladder. The support device comprises a first support frame coupled with the base portion and a second support frame coupled with the base portion. Each of the first and support frames comprise a top portion and a pair of elongate stiles. The first support frame and the second support frame are each pivotable relative to the base portion between a stored position and an extended position. In the extended position, the first support frame top portion is releasably connected to the second support frame top portion. The support device also comprises a tether arrangement operative to disconnect the first support frame from the second support frame such that the first and second support frames may be pivoted to the stored position.