A bed adapted to be supported on a floor , comprising: a plurality of wheels for contacting the floor ; a headboard and a footboard , the footboard spaced apart from the headboard , the headboard and the footboard supported by the plurality of wheels ; a support deck supported by the plurality of wheels , the support deck including a head end positioned proximate the headboard and a foot end positioned proximate the footboard , and at least one support surface extending between the head end of the support deck and the foot end of the support deck ; and a lift system (120; 600) including a first lift system supported by the plurality of wheels , and a second lift system (160; 600) supported by the first lift system the lift system (120; 600) operatively coupled to the support deck to raise and lower the support deck relative to the plurality of wheels , the second lift system (160; 600) including a head end portion positioned proximate the headboard , a foot end portion positioned proximate the footboard , and a middle portion positioned between the head end portion and the foot end portion , the middle portion having a bottom side relative to the floor , the second lift system (160; 600) including a lower frame , an upper frame , and a lifting assembly coupled to the lower frame and the upper frame , the lower frame including the bottom side of the middle portion , wherein the second lift system (160; 600) is configured so that as the second lift system (160; 600) raises the support deck from a lowered position to a raised position, the bottom side of the middle portion moves downward, the bottom side of the middle portion remaining the bottom side of the middle portion throughout the movement of the support deck from the lowered position to the raised position. a plurality of wheels for contacting the floor ; a headboard and a footboard , the footboard spaced apart from the headboard , the headboard and the footboard supported by the plurality of wheels ; a support deck supported by the plurality of wheels , the support deck including a head end positioned proximate the headboard and a foot end positioned proximate the footboard , and at least one support surface extending between the head end of the support deck and the foot end of the support deck ; and a lift system (120; 600) including a first lift system supported by the plurality of wheels , and a second lift system (160; 600) supported by the first lift system the lift system (120; 600) operatively coupled to the support deck to raise and lower the support deck relative to the plurality of wheels , the second lift system (160; 600) including a head end portion positioned proximate the headboard , a foot end portion positioned proximate the footboard , and a middle portion positioned between the head end portion and the foot end portion , the middle portion having a bottom side relative to the floor , the second lift system (160; 600) including a lower frame , an upper frame , and a lifting assembly coupled to the lower frame and the upper frame , the lower frame including the bottom side of the middle portion , wherein the second lift system (160; 600) is configured so that as the second lift system (160; 600) raises the support deck from a lowered position to a raised position, the bottom side of the middle portion moves downward, the bottom side of the middle portion remaining the bottom side of the middle portion throughout the movement of the support deck from the lowered position to the raised position. <EOS>