A rolling stretcher (10) comprising: a support frame (12)； a first part of legs (20) pivotally and slidably coupled to the support frame (12)； a first 5 pair of articulation members (24), each articulation member (24) pivotally coupled to the support frame (12) and to one of the first pair of legs (20)； a first wheel connection (27) pivotally coupled to the first pair of legs (20)； a wheel alignment mechanism (300) incorporated in at least one of the first pair of legs (20), the wheel alignment mechanism (300) comprising a timing chain (410) that is coupled to one of the first pair of articulation members (24) and the first wheel connection (27), a first hub (132a) coupled to one of the first pairs of articulation members (24), and a second hub (132b) coupled to the first connection (27) wheel, wherein the timing chain (410) is coupled to the first hub (132a) and the second hub (132b) to communicate the relative rotation of the first pair of articulation members (24) to the first connection ( 27) wheel； and a chain tensioner (418) coupled to one of the first pair of legs (20), the chain tensioner (418) that makes contact with the distribution chain (410) and that increases the chain path length (410 ) of distribution between the first bushing (132a) and the second bushing (132b), wherein: the first pair of legs (20) and the first pair of articulation members (24) pivot relative to each other in a relationship of relative angular rotation； the wheel alignment mechanism (300) rotates the first wheel connection (27) with respect to the first pair of legs (20) in a reduction ratio； and the relative angular rotation ratio of the first pair of legs (20) and the first pair of articulation members (24) is approximately inverse to the reduction ratio of the wheel alignment mechanism (300).Una camilla (10) rodante que comprende: un bastidor (12) de apoyo； un primer parte de patas (20) acopladas de forma pivotante y de forma deslizante al bastidor (12) de apoyo； un primer 5 pa
